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- M. & N. Hanhart,
- M.L. Bean Museum.
- Maag, Johann Nepomuk,ca 1-24-1
- Maas, Otto,1867-1916
- Maassen, J. Peter,1810-1890
- Mabille, Jules.
- Mabille, P.1835-1923
- Macadam, Robert K.
- Macalister, Alex.
- MacAndrew, Robert.
- MacBride, E. W.
- MacBride, E. W.1866-1940
- Macbride, Ernest William,1866-
- Macbride, J. Francis1892-
- Macbride, Thomas H.1848-1934
- Macculloch, Horatio,1805-1867
- MacDaniel, Sidney.
- Macdonald, M. F.
- MacDonald, Rose Mortimer Ellzey.
- MacDougal, Daniel Trembly,1865-1958
- Macey, John Robert.
- Macfadyen, James,1800-1850
- Macfarlane, John Muirhead,1855-1943
- MacGillivray, Alexander Dyer,1868-1924
- Macgillivray, John,1822-1867
- MacGillivray, P. H.
- Macgillivray, William,1796-1852
- MacGillivray, William,1823-1917
- Machin, Frank
- Mackay, Ernest John Henry,1880-1943
- MacKay, James Townsend,1775-1862
- Mackenzie, D.
- Mackenzie, Kenneth Kent,1877-1934
- Mackinnon, Doris L.
- Mackintosh, L. J.
- MacLean, J. P.1848-1939
- Macleay, William Sharp,1792-1865
- MacLeod, Julius,1857-1919
- Maclurian Lyceum.
- Macmillan, Alexander Stuart.
- MacMillan, Conway,1867-1929
- MacMillan, Donald Baxter,1874-
- Macoun, James M.
- Macoun, James Melville,1862-1920
- Macoun, John,1831-1920
- Macpherson, H. A.
- Macpherson, H. B.
- Macquart, J,1778-1855
- Macquart, Justin,1778-1855
- Macri, Saverio.
- Macself, A. J.1878-1952
- Macy Conference on Genetics1960-:
- Madarász, Gyula,1858-1931
- Mader, Leopold.
- Madras (India : Presidency)
- Madras (India : State).Dept. of Fisheries.
- Madras (India : State).Fisheries Bureau.
- Maerklin, Gustav,
- Maeterlinck, Maurice,1862-1949
- Magalhães, Amilcar Armando Botelho de.
- Magalotti, Lorenzo,1637-1712
- Maglia, Anne M.
- Magnin, Antoine,1848-1926
- Magnus, Hugo.
- Magnus, P.1844-1914
- Magyar Állami Földtani Intézet
- Magyar Biológiai Egyesület.Botanikai Szakosztály.
- Magyar Biológiai Társaság.Botanikai Szakosztály.
- Magyar Entomologiai Társaság.
- Magyar Földtani Társulat.
- Magyar Királyi Földtani Intézet.
- Magyar Királyi Madártani Intézet.
- Magyar Madártani Intézet.
- Magyar Nemzeti Múzeum.
- Magyar ornithologiai központ.
- Magyar Természettudományi Társulat
- Magyar Természettudományi Társulat.
- Magyar Természettudományi Társulat.Növénytani Szakosztály.
- Magyar Tudományos Akadémia.
- Maheshwari, P.1904-1966
- Mahler, D. Luke.
- Mahler, William F.
- Mahul, Alphonse Jacques,1795-1871
- Maibon, J.
- Maiden, J. H.1859-1925
- Maienschein, Jane.
- Maillard, L.
- Maillard, P.-N.1813-1883
- Maine Agricultural Experiment Station
- Maine Naturalist Company.
- Maine Ornithological Society.
- Maine State Pomological Society.
- Maine.Board of Agriculture.
- Maine.Dept. of Agriculture.
- Maine.Dept. of Inland Fisheries and Game.
- Maine.Forest Commissioner.
- Mainwaring, W. F. B. Massey.
- Maitland, James Ramsey Gibson,1848-1897
- Maitland, Robert T.
- Maiwald, V.1862-
- Makarov, Stepan Osipovich,1848-1904
- Makino, Sajiro,1906-
- Makino, Tomitaro,1862-1957
- Makins, F. K.
- Maksimov, N. A.
- Maksimov, N. A.1880-1952
- Malacological Society of London
- Malan, David Edward.
- Malan, S. C.
- Mallada, Lucas,1841-1920
- Mallette, M. Frank1917-
- Malloch, John Russell,1875-
- Malloch, Peter D.
- Mallory, Frank Burr,1862-1941
- Malm, August Vilhelm,1821-1882
- Malmgren, A. J.
- Malmgren, Anders Johan,1834-1897
- Malpighi, Marcello,1628-1694
- Malte, Malte Oscar,1880-1933
- Maly, Joseph Karl,1797-1866
- Mamo, Giuseppe.
- Man, J. G. de
- Man, J. G. de,1850-1930
- Man, Johannes Gevertus de,1850-1930
- Man, Johannes Govertus de.
- Manchester Anglers' Association.
- Manchester Institute of Arts and Sciences.
- Manchester Literary and Philosophical Society.
- Manchester Museum (University of Manchester)
- Mancini, Vincenzo.
- Mandl, Louis,1812-1881
- Mangin, Arthur,1824-1887
- Mangold, Ernst Ludwig Karl Wilhelm Ferdinand,1879-
- Manley, John Jackson.
- Mann, James.
- Mann, K. H.1923-
- Mann, Stuart.
- Mann, Thaddeus,1908-
- Mann, William M.,1886-1960
- Mannerheim, Carl Gustav,1797-1854
- Mansel-Pleydell, John Clavell,1817-1902
- Mansfield, Ira Franklin,1942-
- Mansfield, William James,1878-
- Mansuy, Henri Alphonse,1857-
- Mantell, Gideon Algernon,1790-1852
- Manton, I.
- Mapleton-Bree, H. W.,
- Marasco, Richard J.
- Maratti, Giovanni Francesco,d 17-7
- Marble, Charles C.
- Marcailhou-d'Ayméric, Alexandre,1839-1897
- Marcailhou-d'Ayméric, Hippolyte,1855-1909
- Marchal, Emile,1871-1954
- Marchand, J.
- Marchand, Léon,1833-1911
- Marchand, Richard Werner.
- Marchi, Giuseppe.
- Marcou, John Belknap.
- Marcou, Jules,1824-1898
- Marcus, Adolphi.
- Marcus, Leslie F.
- Marcusen, Johann.
- Marenzeller, Emil von.
- Marenzeller, Emil,1845-1918
- Marett, R. R.1866-1943
- Marey, Etienne-Jules,1830-1904
- Marggraf, Georg,1610-1644
- Maria Mitchell Association.
- Marin, Otto Ulrik,1805-1846
- Marine Biological Association of the United Kingdom
- Marine Biological Association of the United Kingdom.
- Marine Biological Laboratory (Woods Hole, Mass.)
- Marine Biological Laboratory (Woods Hole, Mass.).
- Marine Biological Laboratory (Woods Hole, Mass.).Systematics-Ecology Program.
- Marine Biological Laboratory.
- Marion, Antoine-Fortune.
- Maris, Jean Baptiste George,1780-1846
- Mariscal, Richard N ,1935-
- Mark, E. L.1847-1946
- Marktanner-Turneretscher, Gottlieb.
- Marlborough-Gerson Gallery.
- Marloth, Rudolf,1855-1931
- Marquand, Ernest David,1848-1918
- Marrat, F.
- Marrero, Crispulo.
- Marriner, George R.
- Marron, Eugene Marie1904-
- Marschall von Bieberstein, Friedrich August,1768-1826
- Marschall, August Friedrich,1804-1887
- Marsden, J. Ellen.
- Marseul, S.-A. de1812-1890
- Marsh, C. Dwight
- Marsh, George Perkins,1801-1882
- Marsh, Millard Caleb,1872-
- Marsh, Othniel Charles,1831-1899
- Marshall, A. Milnes,1852-1893
- Marshall, Charles E.1866-1927
- Marshall, Charles Henry Tilson,1841-
- Marshall, F. H. A.1878-1949
- Marshall, G. F. L.1843-1934
- Marshall, Guy Anstruther Knox,1871-
- Marshall, Larry G.
- Marshall, Nina L.
- Marshall, Thomas Ansell.
- Marshall, William
- Marshall, William,1845-
- Marsilly, Louis de Commines de,1811-
- Marsson, Theodor Friedrich,1816-1892
- Marston, Robert Bright,1853-1927
- Martens, Eduard von,1831-1904
- Martens, Georg von,1788-1872
- Martens, James H. C.1901-
- Martersteck, Johann Clemens.
- Martin Saint-Ange, G. J.1803-1888
- Martin, Albert,1916-
- Martin, Annie.
- Martin, Emile,1810-1895
- Martin, Friedrich.
- Martin, G. W.1886-1971
- Martin, H. Newell1848-1896
- Martin, J. H.1919-
- Martin, Johan Fredrik,1755-1816
- Martin, L.
- Martin, Paul S.1899-1974
- Martin, Paul S.1899-1974
- Martin, René
- Martin, René,1846-1925
- Martin, Richard A.
- Martin, Toby.
- Martinati, Pietropaolo.
- Martinet, Francois Nicolas,1731-
- Martini, Erich Christian Vilhelm,1880-
- Martini, Friedrich Heinrich Wilhelm,1729-1778
- Martini, Friedrich Heinrich Wilhelm,1729-1778
- Martins, Charles,1806-1889
- Martius, Heinrich von,1781-1831
- Martius, Jeremias,d. 1585-
- Martius, Karl Friedrich Philipp von,1794-1968
- Martius, Karl Friedrich Philipp von,1794-1868
- Martorelli, Giacinto.
- Martrin-Donos, Victor de,1801--187
- Martyn, Thomas,1735-1825
- Marx, George
- Marx, Hymen.
- Mary, Benj.
- Maryland Academy of Science and Literature.
- Maryland Academy of Sciences
- Maryland Academy of Sciences.
- Maryland Agricultural Experiment Station
- Maryland Geological Survey
- Maryland.Commissioners of Fisheries.
- Maryland.Geological Survey, 1896-
- Maryland.Shell Fish Commission.
- Maryland.Shellfish Commission.
- Mascardi, Vitalis.
- Maske, Erich,1876-
- Mason, Frances Baker.
- Mason, Francis,1799-1874
- Mason, J.
- Mason, John Alden,1885-1967
- Mason, John J.
- Mason, John James.
- Mason, John M.
- Mason, Philip B.
- Mason, Robert Hindry.
- Mason, Silas C.b. 1857.-
- Mason, William T.
- Massachusetts Audubon Society.
- Massachusetts Horticultural Society.
- Massachusetts Society for Promoting Agriculture.
- Massachusetts.Commissioners on Fisheries and Game.
- Massachusetts.Dept. of Conservation.
- Massachusetts.Secretary of the Commonwealth.
- Massachusetts.State Board of Agriculture
- Massachusetts.State Board of Agriculture.
- Massachusetts.Superintendent for supressing the gypsy and brown-tail moths.
- Massachusetts.Zoological and Botanical Survey
- Massachusetts.Zoological and Botanical Survey.
- Massalongo, A. B.1824-1860
- Massé, H.
- Massee, George,1850-1917
- Massey, Walter E.
- Massingham, H. J.1888-1952
- Massonnat, Émile.
- Mast, Samuel Ottmar,1871-
- Masterman, Arthur Thomas.
- Masterman, George Frederick.
- Masters, George,1837-1912
- Mate, Bruce R.
- Mather, Frank J.1911-2000
- Mather, Kenneth.
- Mathers, Sandra.
- Mathev, Fred.
- Mathew, Murray A.
- Mathews, F. Schuyler1854-1938
- Mathews, Gregory M.1876-1949
- Mathewson, Robert F.
- Mathiae Andreae Schmidt.
- Mathias, Mildred Esther,1906-
- Mathieu, Auguste,1814-1890
- Maton, William George,1774-1835
- Matschie, Paul,1861-1926
- Matschie, Paul.
- Matson, George Charlton.
- Matsumura, Jinzo,1856-1928
- Matthai, G.
- Matthew, William Diller,1871-1930
- Matthews, A.1815-1897
- Matthews, John E.,1937-
- Matthews, John,
- Matthews, L. Harrison
- Mattioli, Pietro Andrea,1500-1577
- Mattirolo, Oreste,1856-1947
- Maubert
- Maumus, Jean.
- Maupas, E.,
- Maury, Carlotta Joaquina,1874-1938
- Maw, George,1832-1912
- Mawe, John,1764-1829
- Mawe, John,1764-1829
- Mawley, Edward.
- Maxson, Asa Chandler,1875-
- Maxson, Linda R.
- Maxwell, Aymer Edward,1877-1914
- Maxwell, C. N.1872-
- Maxwell, Herbert,
- Maxwell-Lefroy, H.1877-1925
- May, W. L.
- Mayden, Richard L.
- Mayer, A. F. J. C.1787-1865
- Mayer, Alfred Goldsborough,1868-
- Mayer, Alfred Goldsborough,1868-1922
- Mayer, Christine A.
- Mayer, Paul
- Mayer, Paul.
- Mayer, William V.
- Maynard, C.
- Maynard, C. J.1845-1929
- Maynard, Lucy Warner,1852-1936
- Maynard, Lucy Warner,1852-1936
- Maynard, Thomas Poole,1883-
- Maynard, Washburn,1844-
- Mayor, Alfred Goldsborough,1868-1922
- Mayr, Ernst,1904-
- Mayr, Ernst,1904-2005
- Mayr, Gustav L.,1830-1908
- Mayr, Gustav Leopold,1830-1908
- Mazé, H.1818-1892
- Mazel, Antoine.
- Mazin, Jean-Michel.
- Mazÿck, William Gaillard,1846-
- Mazza, Angelo.
- McAlpine, Daniel.
- McAndrew, James,1836-1917
- McAndrew, Robert.
- McAtee, W. L.1883-1962
- McCarroll, Steven M.
- McCauley, James Elias.
- McClatchie, Alfred James.
- McClelland, John,d. 1883-
- McClure, Robert John Le Mesurier,1807-1873
- McClymont, James R.
- McCollom, William C.
- McCook, Henry C.1837-1911
- McCormack, Thomas J.1865-1932
- McCormick, Harold W.1903-
- McCormick, Lewis M.
- McCoy, Frederick,1823-1899
- McCracken, Mary Isabel.
- McCreary, Otto
- McCulloch, Allan Riverton,1885-1925
- McDaniel, Burruss.
- McDonald, Ellice,1876-
- McDonald, Nicholas G.
- McDougall, W. B.1883-
- McDunnough, James Halliday,1877-
- McElroy, William David,1917-
- McFarland, Frank Mace,1869-1951
- McFarland, Raymond,1872-
- McGary, James W.
- McGlone, Bartgis,1881-
- McGregor, R.
- McGregor, Richard C.1871-1936
- McGregor, Richard Crittenden,1871-
- McGrew, Paul Orman,1909-
- McGuire, J. C.,
- McGuire, John A.,1869-
- McHugh, J. L.1911-
- McIlvaine, Charles,1840-1909
- McIlwraith, Thomas,1824-1903
- McIlwraith, Thomas.
- McIntosh, William Carmichael,1838-
- McIntosh, William Carmichael,1838-1931
- McKinley, George Murray,1893-
- McKinney, Frank K.
- McKinnon, Daniel,1767-1830
- McKnight, Bill N.
- McLachlan, Robert,1837-1904
- McLean, R. C.1890-
- McLellan, Garey L.
- McLenegan, S. B.
- M'Clintock, Francis Leopold,1819-1907
- McMurrich, J. Playfair1859-1939
- McMurtrie, Henry,1793-1865
- McMurtrie, William,1851-1913
- McNair, James Birtley,1889-
- McNair, James Birtley,1889-1967
- McNeil, Perl L., Jr.
- McVaugh, Rogers,1909-
- McVey, Eileen.
- Meade, Grayson E.
- Meade, R. H.
- Meares, John,1756--180
- Mearns, Edgar Alexander,1856-1916
- Medawar, P. B.1915-
- Medem, Federico.
- Medem, Fred.
- Medén, Jonas Fredrik,1800-1838
- Medico-Botanical Society of London.
- Medikus, Friedrich Kasimir,1736-1808
- Medinaceli, duque de.
- Medizinisch-naturwissenschaftliche Gesellschaft zu Jena.
- Meech, William Witler,1825-
- Meehan, Thomas,1826-1901
- Meek, F. B.1817-1876
- Meek, Seth E.1859-1914
- Meek, Seth Eugene,1859-1914
- Meerburgh, Jacobum.
- Meerburgh, Nicolaas,1814
- Meerwarth, Hermann,1870-
- Mees, C. E. Kenneth1882-1960
- Méhely, Lajos.
- Meigen, Johann Wilhelm,1764-1845
- Meijere, Johannes Cornelis Hendrik de,1866-
- Meijere, Johannes Cornelis Hendrik de.
- Meil, Clayton Dissinger.
- Meinert, Fr.1833-1912
- Meinert, Frederik Vilhelm August,1833-1903
- Meinert, Frederik Vilhelm August,1833-1912
- Meinert, Frederik.
- Meinertzhagen, Dan.
- Meinshausen, Karl Friedrich,1819-1899
- Meisenheimer, Johannes,1873-1933
- Meisner, Friedrich,1765-1825
- Meissner, Max.
- Meister, Jakob.
- Meister, Waldemar
- Mela, A. J.1846-1904
- Melander, A. L.1878-
- Melander, A. L.1878-
- Melichar, Leopold.
- Melin, Elias,1889-
- Mell, C. D.
- Mell, Rudolf,1878-
- Melle, Jakob von,1659-1743
- Mellen, Laura M.
- Mellerborg, Claus Erik.
- Mello Moraes, A. J. de1816-1882
- Melo, Gabriel A. R.
- Melsheimer, Friedrich Ernst.
- Melvill, James Cosmo
- Melville, Richard1914-1993
- Mendel Society.
- Mendel, Gregor,1822-1884
- Mendelian Society of Lund.
- Mendelson, Joseph R.
- Mendes da Costa, Emanuel,1717-1791
- Ménégaux, Auguste1857-1937
- Menegaux, Auguste,1857-1937
- Meneses, Henry Power.
- Ménétriés, E.1802-1861
- Menge, Edward John von Komorowski,1882-
- Menke, Karl Theodor,1791-1861
- Menkes, B.
- Mense, Carl Anton,1861- ed
- Mentz, August,1867-1944
- Menyharth, Lászlo,d 18-7
- Menz, Friedrich,1673-1749
- Menzbir, M. A.1855-1935
- Menzel, August,1810-1878
- Menzel, Paul.
- Menzies, Archibald,1754-1842
- Menzies, J. I.
- Mercer, E. H.1919-
- Mercet, Ricardo García.
- Mercier, Elysée,1802-1863
- Mercier, Lewis Page.
- Meredith, De Witt.
- Meredith, Lewis B.
- Meriden Scientific Association.
- Merino, Baltasar,1845-1917
- Merkel, Eduard.
- Mermet, C.
- Merrem, Blasius,1761-1824
- Merriam, C. Hart1855-1942
- Merrifield, F.
- Merrill, Elmer Drew,1876-1956
- Merrill, G. L. Smith.
- Merrill, George P.1854-1929
- Mershon, W. B.
- Mertens, Franz Carl,1764-1831
- Mertens, Robert,1894-
- Mertz, Henry Ney.
- Merzbacher, Ludo.
- Meschinelli, Luigi,1865-
- Mesecar, Roderick S.
- Mesnel, A.,
- Mesnil, Felix Etienne Pierre,1845-1922
- Metaxà, Luigi,1778-1842
- Metcalf, Maynard M.1868-1940
- Metcalf, Maynard Mayo,1868-1940
- Metcalf, Zeno Payne,1885-1937
- Metcalfe, J. W.
- Metchnikoff, Elie,1845-1916
- Methven, K.
- Metschnikoff, Elias,1845-1916
- Mettenius, Georg Heinrich,1823-1866
- Metzer, Christian.
- Metzger, A.
- Meunier,
- Meunier, Alphonse,1857-1918
- Meunier, Fernand.
- Mewes, W.
- Mexico.Comisión para la Destrucción de la Langosta.
- Mexico.Ministerio de fomento, colonizacion e industria.
- Mexico.Ministerio de Fomento.
- Mexico.Museo Nacional de Historia Natural.
- Mexico.Secretaría de Fomento
- Mey, Johannes de,1617-1678
- Meyer, Adolf Bernhard,1840-1911
- Meyer, Bernard S.1901-
- Meyer, Bernhard,1767-1836
- Meyer, Carl Anton,1795-1855
- Meyer, Ernst Heinrich Friedrich,1791-1858
- Meyer, Fr.
- Meyer, Friedrich Albrecht Anton,1768-1795
- Meyer, Friedrich Gottlieb.
- Meyer, G. F. W.1782-1856
- Meyer, Heinrich Adolf,1822-1889
- Meyer, Hermann von,1801-1869
- Meyer, Paul
- Meyer, Werner Th.
- Meyerhof, Otto,1884-1951
- Meyncke, Oscar Marion,1849-1936
- Meyrick, Edward,1854-1938
- Meyrick, Edward.
- Meysey-Thompson, Richard Frederick,1847-1926
- Mez, Carl,1866-1944
- M'Gregor-Robertson, J.1858-1925
- Miall, Bernard,1876-
- Miall, L. C.1842-1921
- Michael Anton David.
- Michael, A. D.1836-1927
- Michael, Albert Davidson,1836-1927
- Michael, Edmund,1849-1920
- Michaelis, Leonor,1875-1949
- Michaelsen, W.1860-1937
- Michalet, Eugène.
- Michaud , André Louis Gaspard.
- Michaud, André Louis Gaspard,1795-1880
- Michaud, André Louis Gaspard.
- Michaux, André,1746-1802
- Michelet, Jules,1798-1874
- Micheli, Marc,1844-1902
- Michelin, Hardouin,1786-1867
- Michell, E. B.1843-
- Michelotti, Giovanni,1812-1898
- Michener, Charles Duncan,1918-
- Michener, Ezra,1794-1887
- Michie, Christopher Young.
- Michigan Academy of Science, Arts, and Letters
- Michigan Academy of Science.Council.
- Michigan Botanical Club.
- Michigan State Agricultural Society.
- Michigan State College.Agricultural Experiment Station.
- Michigan State Farmers' Institutes.
- Michigan State Horticultural Society.
- Michigan State Pomological Society.
- Michigan.Dept. of zoology and physiology.
- Michigan.Geological Survey
- Michigan.State Board of Agriculture.
- Michon, L. A. Joseph.
- Mickel, John.
- Microscopical Society of London.
- Middlebury College.
- Middlekauff, Woodrow Wilson,1913-
- Middleton, A. J.,
- Miège, Em.
- Miers, Edward J.
- Miers, John,1789-1879
- Migdalski, Edward C.
- Migout, Abel.
- Migula, Walter,1863-1938
- Miklukho-Maklai, Nikolai Nikolaevich,1846-1888
- Mikulic, Donald G.
- Milachewitch, K. O.
- Milam, R. C.
- Milburn, Thomas,1874-1935
- Milcke, T.,
- Miles, A. Ashley1904-
- Milet de Mureau, Louis Marie Antoine Destouff,
- Miliczky, Eugene R.
- Millais, John Guille,1865-1931
- Millan, J.
- Millar, J. R.
- Miller, Alonzo Alexander,1865-1933
- Miller, Benjamin L.1874-1944
- Miller, Benjamin Le Roy,1874-
- Miller, Carrie Ella.
- Miller, Gerrit S.1869-1956
- Miller, Gerrit Smith.
- Miller, Harriet Mann,1831-1918
- Miller, Hugh,1802-1856
- Miller, J.
- Miller, J. Martin1859-
- Miller, John Sebastian.
- Miller, John,1715-1790
- Miller, Konrad,1844-1933
- Miller, Loye Holmes,1874-
- Miller, Max W.
- Miller, Olive Thorne,1831-1918
- Miller, Philip,1691-1771
- Miller, Robert Rush,1916-2003
- Miller, S. A.1836-1897
- Miller, William Snow.
- Miller, William.
- Millet de la Turtaudiere, Pierre Aime,1783-1873
- Millet, Fortescue William.
- Millet, P.-A.
- Millière, Pierre.
- Mills, Enos Abijah,1870-1922
- Mills, Harlow B.1906-
- Mills, Harlow B.1906-1971
- Mills, Wesley,1847-1915
- Millspaugh, Charles Frederick,1854-1923
- Milne, Lorus Johnson,1912-
- Milne-Edwards, Alphonse,1835-1900
- Milne-Edwards, H.1800-1885
- Milne-Home, David,1805-1890
- Milton, William Fitzwilliam,1839-1877
- Miltz, Otto.
- Minchin, Edward Alfred,1866-1915
- Minckley, Robert L.
- Minding, Julius,1809-
- Minne, Achille.
- Minnesota Seaside Station.
- Minnesota State Horticultural Society.
- Minnesota.State Entomologist.
- Minnesota.State Zoologist.
- Minot, Charles Sedgwick,1852-1914
- Minot, H. D,1859-1890
- Minot, Henry Davis,1859-1890
- Mintern Bros.,
- Minton, Sherman A.
- Miquel, Friedrich Anton Wilhelm,1811-1871
- Miquel, Pierre,1850-1922
- Miskin, W. H.
- Mission Gruvel sur la còte occidentale d'Afrique(190--191
- Mission scientifique du cap Horn, 1882-1883.
- Mission scientifique du Cape Horn, 1882-1883.
- Mississippi Valley Horticultural Society.
- Mississippi.State Geologist.
- Missouri Botanical Garden.
- Missouri State Horticultural Society.
- Missouri.Dept. of Conservation.
- Missouri.State Board of Agriculture.
- Missouri.State Entomologist.
- Mitchell, Evelyn Groesbeeck
- Mitchell, F. S.
- Mitchell, Mason.
- Mitchell, P. Chalmers1864-1945
- Mitchell, Rodger David,1926-
- Mitchell, William Stephen,1840-1892
- Mitlacher, Wilhelm,1872-1913
- Mitrofanov, P.I.
- Mivart, St. George Jackson,1827-1900
- Mjöberg, Eric,1882-1938
- Mniszech,fl 1-56-1
- Moale, William A.
- Möbius, Karl August,1825-1908
- Möbius, M.1859-
- Mochulskii, Viktor Ivanovich,ca 1-10-1
- Mocquard, Francois.
- Modigliani, Elio,1861-
- Modin, Bengt Theodor,1803-1875
- Moehring, Paul Heinrich Gerhard,1710-1792
- Moench, Conrad,1744-1805
- Moerbeek, Adam Abrahamzoon.
- Moessel, Julius
- Moffatt, Will Sayer,1847-
- Moffett, Lacy I.
- Moggridge, J. Traherne1842-1874
- Moggridge, John Traherne.
- Mögling, Theodor.
- Mohl, Hugo von,1805-1872
- Mohn, Henrik,1835-
- Mohr, Carl Otto,1902-
- Mohr, Charles,1824-1901
- Mojsisovics, August,1848-
- Mojsisovics, Edmund,1839-1907
- Moldenke, Alma L.1908-
- Moldenke, Harold N.1909-
- Molina R , Antonio.
- Molina R, Antonio,
- Molisch, Hans,
- Molisch, Hans,1856-1937
- Molkenboer, J. H.1816-1854
- Möllendorff, O. F. von.
- Möllendorff, O. von.
- Möllendorff, Otto Franz von,1848-1903
- Möller, Alfred,1860-1922
- Møller, Birgitte Christine,1857-
- Möller, H. P. C.
- Molyneux, Herbert E.
- Monaco, Mark E.
- Monardes, Nicolás,ca. 1512-1588
- Moninckx, Johan.
- Moninckx, Maria.
- Monnot, E.
- Monro, Alexander,1733-1817
- Monro, Alexander,1773-1859
- Mons, Jean Baptiste van,1765-1842
- Montagne, C.1784-1866
- Montagne, Camille,1784-1866
- Montagne, Jean François Camille,1784-1866
- Montagu, Ashley,1905-
- Monteil, Paul.
- Montes de Oca, Rafael,19th-cent
- Montgomery, Edmund,1835-1911
- Montgomery, Thomas Harrison,1873-1912
- Monti, Rina,1872-
- Montillot, Just Marie Nicolas,1847-1890
- Montpetit, A.
- Moodie, Roy Lee,1880-
- Moodie, Roy Lee,1880-1934
- Moody, Paul Amos,1903-
- Moore, Carl Richard, 1892-
- Moore, David,1807-1879
- Moore, Frederic,1830-1907
- Moore, J. Percy1869-
- Moore, John Edward S.
- Moore, Joseph Curtis,
- Moore, Spencer Le Marchant,1850-1931
- Moore, Thomas,1821-1887
- Moorehead, Warren King,1866-1939
- Moquin-Tandon, Alfred,1804-1863
- Moquin-Tandon, Gaston,1845-
- Moran, Robbin C.
- Morán, Rolando
- Mörch, O. A. L.1828-1878
- Mørch, O. L. A.
- Mørch, Otto Andreas Lowson,1828-1878
- Mörch, Otto Andreas Lowson.
- Mordvilko, Aleksandr Konstantinovich.
- More, Alexander Goodman,1830-1895
- More, Louis Trenchard,1870-
- Moreau de Jonnès, Alexandre,1778-1870
- Moreau, Charles Émile.
- Moreau, Émile,1823-1896
- Moreau, Émile,1852-1922
- Morelet, Arthur,1809-
- Morelet, Arthur,1809-1892
- Morelet, Arthur.
- Morgan, A. P.1836-1906
- Morgan, Ann Haven,1882-1966
- Morgan, C. Lloyd1852-1936
- Morgan, Lewis Henry,1818-1881
- Morgan, Thomas Hunt,1866-1945
- Moricand, Moïse Étienne,1780-1854
- Morinière, Noël de la,1765-1822
- Moris, Giuseppe Giacinto,1796-1869
- Morison, Robert S.,1906-
- Moritz, Francisco.
- Moriyama, Hideo.
- Morlet, L.
- Morley, Claude.
- Morley, Margaret Warner,1858-1923
- Moro, Alessandro.
- Morren, Charles,1807-1858
- Morren, Edouard,1833-1886
- Morrey, Charles Bradfield,1869-
- Morris, C. W. G.
- Morris, Charles,1833-1922
- Morris, F. O.1810-1893
- Morris, Frederick K.1886-
- Morris, John G.1803-1895
- Morris, John,1810-1886
- Morris, Michael A.1956-
- Morris, Richard,
- Morris, Robert O.
- Morris, Robert Oliver,1846-1925
- Morris, William Gouverneur,d 18-4
- Morrison, Alfred J.
- Morrison, John H.1927-
- Morrison, Philip.
- Morrison, W. P.
- Morrison-Scott, Terence Charles Stuart,d199-
- Morse, Albert P.1863-1936
- Morse, Edward Sylvester,1838-1925
- Morss, Charles B.
- Mortensen, Th.1868-1952
- Mortensen, Theodor,1868-1952
- Mortensen, Theodore,1868-1952
- Mortensen, Thomas.
- Morton, Friedrich,1890-
- Morton, James.
- Morton, Kenneth J.
- Mosby, Olav.
- Mösch, Casimir,1827-1898
- Möschler, Heinrich B.1831-1888
- Moscoso, R. M.
- Moseley, H. N,1844-1891
- Moseley, H. N.1844-1891
- Moser, Fanny.
- Mosher, A. A.
- Mosher, Edna.
- Moskovskoe entomologicheskoe obshchestvo.
- Moskovskoe obshchestvo liubitelei prirody.
- Moss, Charles Edward,1872-1930
- Moss, E. G. B.
- Mössler, Johann Christoph.
- Mossman, R. C.1870-
- Mottet, Séraphin Joseph,1861-1930
- Mouillefert, P.1846-1903
- Moulton, Forest Ray,1872-1952
- Mount Desert Island Biological Laboratory.
- Mourelle de la Rúa, Francisco Antonio,1750-1820
- Mousson, Albert,1805-1890
- Mouton-Fontenille, Marie Jacques Philippe,1769-1837
- Moyen, J.1828-1899
- Moziño, José Mariano,1757-1820?
- Mudie, Robert,1777-1842
- Muecke, Fliege,
- Mueller, Ferdinand von,1825-1896
- Mueller, Gregory M.
- Mueller, Gregory Michael.
- Mueller, Robert Francis,1923-
- Muhlenberg, Henry,1753-1815
- Muir, Jessie.
- Muir, John,1838-1914
- Muirhead, George
- Mulder Bosgoed, D.1837-1880
- Mulertt, Hugo
- Mulertt, Hugo.
- Mulgrave, Constantine John Phipps,1744-1792
- Mullens, W. H.1866-
- Müller, Adolf
- Müller, Adolf,1821-1910
- Müller, August,1810-1875
- Müller, C. F. A.
- Müller, Carl,1817-1870
- Müller, Carl,1855-1907
- Muller, Félix,1818-1896
- Müller, Ferdinand Jacob Heinrich von,1825-1896
- Müller, Fritz,1822-1897
- Müller, Fritz.
- Müller, Gustav Wilhelm,1857-
- Müller, J.
- Müller, J. W.,
- Müller, Joh.,1801-1858
- Müller, Johann,1828-1896
- Müller, Johannes,
- Müller, Karl
- Müller, Karl,1818-1899
- Müller, Karl,1825-
- Müller, Karl,1825-1905
- Müller, Karl,1818-1899
- Müller, Otto Frederik,1730-1784
- Müller, Peter Erasmus,1776-1834
- Müller, Th.
- Muller, Theodore,1883-
- Müller, Walter,
- Mullins, L. J.1917-
- Mulsant, Martial Étienne,1797-1880
- Munby, Giles,1812-1876
- Münchener Entomologischer Verein.
- Münchhausen, Otto,1716-1774
- Münchner Entomologische Gesellschaft.
- Mundahl, C. M.
- Munniks, Johannes,1652-1711
- Munro, William,1818-1880
- Munson Steamship Line.
- Münster, Georg,1776-1844
- Münsterberg, Hugo,1863-1916
- Munz, Philip A.1892-
- Muquardt, C.
- Murbeck, Sv1859-1946
- Murbeck, Sv.1859-1946
- Murchison, Charles,1830-1879
- Murdoch, James Barclay.
- Murie, James R.
- Murie, James.
- Murie, Olaus Johan,1889-1963
- Murneek, Andrew Edward,1888-
- Murphy, James B.1939-
- Murphy, John Mortimer
- Murphy, Robert Cushman,1887-1973
- Murra, John V.
- Murray, Andrew,1812-1878
- Murray, George Robert Milne,1858-
- Murray, George,1858-1911
- Murray, James
- Murray, James A.
- Murray, Johan Anders,1740-1791
- Murray, John,1841-1914
- Murray, W. H. H.1840-1904
- Murray-Aaron, Eugene,1852-1941
- Murray-Brown, Mark.
- Murrill, William A.,1869-1957
- Murtfeldt, Mary Esther.
- Muschler, Reinhold Conrad,1883-1957
- Musée colonial de Marseille.
- Musée Delessert.
- Musée d'histoire naturelle de Caen.
- Musée d'histoire naturelle de Marseille.
- Musée du Congo belge
- Musée Guimet d'histoire naturelle.
- Musée royal d'histoire naturelle de Belgique
- Musée royal d'histoire naturelle de Belgique.
- Musée scientifique et archéologique (Douai, France)
- Musée Scolaire Deyrolle.
- Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"
- Museo civico di storia naturale (Trieste, Italy)
- Museo civico di storia naturale di Genova (Italy)
- Museo civico di storia naturale di Milano.
- Museo de Historia Natural de Valparaíso (Valparaíso, Chile)
- Museo de La Plata.
- Museo Imperiale di Fisica e Storia Naturale di Firenze.
- Museo Nacional de Bolivia.
- Museo Nacional de Buenos Aires.
- Museo Nacional de Ciencias Naturales (Spain)
- Museo Nacional de Costa Rica
- Museo Nacional de Historia Natural (Chile)
- Museo Nacional de Historia Natural de Buenos Aires.
- Museo Poey.
- Museo Público de Buenos Aires.
- Museu Botanico do Amazonas.
- Museu e Laboratório Zoológico e Antropológico (Portugal)
- Museu Nacional (Brazil)
- Museu Paulista
- Museu Paulista.
- Muséum d'Histoire Naturelle (Paris)
- Muséum d'histoire naturelle de Genève.
- Muséum d'Histoire Naturelle(Paris)
- Museum Francisco-Carolinum.
- Museum Godeffroy
- Museum Godeffroy.
- Museum Martorell.
- Muséum national d'histoire naturelle (France)
- Muséum national d'histoire naturelle (France),
- Museum of Natural History (U.S.)
- Museum of Practical Geology (Great Britain)
- Museum of Zoology (Cambridge, England.
- Museum voor Economische Botanie (Bogor, Indonesia)
- Museums Trustees of Kenya.
- Mutchler, Andrew Johnson
- Mutchler, Andrew Johnson.
- Mütze, Wilhelm.
- Muybridge, Eadweard,1830-1904
- Muzeum imienia Dzieduszyckich.
- Myers, George S.1905-1985
- Myers, Harriet Williams.
- Myers, Jennie C.
- Myint Lwin Thein.
- Myrick, Herbert,1860-
- Mysore (India : State).Dept. of Agriculture.
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