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- Pabst, G.d. 1911.-
- Pacific Northwest Laboratory.
- Pacific Science Association.
- Pacific Science Congress1949-:
- Pacific Science Congress1953-
- Packard, A. S.1839-1905
- Paetel, Friedrich,1812--188
- Page, Lawrence M.
- Pagenstecher, Arnold,1837-1913
- Pagenstecher, Arnold, 1937-1913.
- Pagenstecher, H. Alexander1825-1889
- Page-Roberts, F.
- Palacký, J.
- Palacký, Jan,1830-1908
- Paladilhe, Alcide,d 18-6?
- Palaeontographical Society (Great Britain)
- Paláu y Verdéra, Antonio.
- Paleariniano.
- Paleontological Research Institution (Ithaca, N.Y.)
- Palibin, I. V.1872-1949
- Palisot de Beauvois, Ambrose-Marie-François-Joseph,1752-1820
- Palladin, Vladimir Ivanovich,1859-1922
- Pallary, Paul,1869-
- Pallas, Peter Simon,1741-1811
- Palmeirim, Jorge M.
- Palmén, Johan Axel,1845-1919
- Palmén, Johan Axel.
- Palmer, Julius A.1840-1899
- Palmer, Katherine V. W.1895-
- Palmer, Leroy Sheldon,1887-
- Palmer, Rose Amelia.
- Palmgrén, Carl Gustaf.
- Palmii, Jo. Jacobi.
- Palmstruch, J. W.1770-1811
- Palun, Maurice,1777-1860
- Pammel, L. H.1862-1931
- Pampanini, R.1875-1949
- Pampel, Wilhelm.
- Pamplin, G.
- Panama City Laboratory.
- Panceri, Paolo,1833-1877
- Pancic, Josif,1814-1888
- Panckoucke, C. L. F.1780-1844
- Panckoucke, Ernestine,d. 1860.-
- Pandellé, Louis.
- Panizza, Bartolomeo,1785-1867
- Pantel, J.
- Pantocsek, Josef,1840-1916
- Pantocsek, Josef.
- Pantu, Zacharia C.,1866-1934
- Panzer, Georg Wolfgang Franz,1755-1829
- Paolucci, Luigi.
- Papadakis, Maria.
- Papenfuss, Theodore J.
- Papillon, Jean-Michel,1698-1776
- Pâque, Égide,1850-1918
- Paquet,
- Pardee, R. G.1811-1869
- Pardo y Sastrón, José,1822-1909
- Parelius, Daniel,
- Paris, E. G.1827-1911
- Paris, Paul,1875-
- Paris, Paul.
- Park, Orlando,1901-1969
- Parke, Davis & Company.
- Parker, George Howard,1864-1955
- Parker, John Bernard.
- Parker, Patrick L.
- Parker, R. N.
- Parker, Robert H.
- Parker, T. Jeffery1850-1897
- Parker, Thomas Jeffery.
- Parker, W. N.d 19-3
- Parker, William Belmont,1871-1934
- Parker, William Kitchen,1823-1890
- Parkes, A. S.1900-
- Parkes, Kenneth C.
- Parkhurst, H. E,1848-1916
- Parkhurst, H. E.1848-1916
- Parkinson, James,1755-1824
- Parkinson, John,1567-1650
- Parlatore, Filippo,1816-1877
- Parmelee, Jeffrey R.
- Parmentier, Antoine Augustin,1737-1813
- Parnell, Richard,1810-1882
- Parpart, Arthur Kemble,1903-
- Parr, Sam A.
- Parra-Olea, Gabriela.
- Parry, Charles Christopher,1823-1890
- Parry, F. J. Sidney.
- Parshley, H. M.1884-1953
- Parsons, Frances Theodora,1861-1952
- Parsons, John Herbert,1868-1957
- Parsons, Marion Randall.
- Parsons, Samuel Bowne,1819-1906
- Pascher, Adolf,1881-1945
- Pascoe, Francis Polkinghorne,1813-1893
- Pasquier, Joseph Philippe Adolphe.
- Pass, J.,
- Passerini, Giovanni,1816-1893
- Pasteur, Louis,1822-1895
- Patch, Edith M.1876-1954
- Paton, Lucy Allen.
- Patouillard, N.
- Patten, Charles Joseph,1870-
- Patten, William,1861-1932
- Patterson, Bruce D.
- Patterson, Bryan,1909-1979
- Patterson, Harry N.1853-1919
- Patterson, J. H.1867-1947
- Pattillo, Mark E.
- Patuxent Wildlife Research Center.
- Paul, B. H.
- Paul, C. M.
- Paul, C. R. C.
- Paul, J. Harland1900-1971
- Paul, William,1822-1905
- Paulet, Jean-Jacques,1740-1826
- Pauling, Linus,1901-
- Paulino de Oliveira, M.1837-1899
- Paulino d'Oliveira, M.
- Paulizky, Heinrich Felix,d. 1792.-
- Paulsen, Ove Vilhelm,1874-1947
- Paulson, Otton Mikhailovich,1837-1886
- Paulucci, M.
- Paulucci, Marianna,1837-
- Paulus,
- Pauquet,
- Pautler, Lynn Patricia.
- Pavlov, Ivan Petrovich,1849-1936
- Pavón, José,1754-1840
- Pavón, José,fl. 1800.-
- Pax, Ferdinand,1858-1942
- Pax, Ferdinand,1885-
- Pax, Wolfgang.
- Paxton, Joseph,1803-1865
- Payer, J.-B.1818-1860
- Paykull, Gustaf von,1757-1826
- Payne, F. F.
- Payne-Gallwey, Ralph,1848-1916
- Paynter, Raymond A.
- Payraudeau, B. C.
- Pazos, José H.
- Peabody Museum of Natural History.
- Peabody, Albert L.
- Peabody, Selim H.1829-1903
- Peabody, William Bourn Oliver,1799-1847
- Peach, Benjamin Neeve,1842-1926
- Peale, Titian Ramsay,1799-1885
- Pearce, Ethel Katharine,1856-
- Pearl, Maud M. De Witt.
- Pearl, Raymond,1879-1940
- Pearse, A. S.1877-1956
- Pearse, Peter H.
- Pearson, E. S.1895-
- Pearson, Karl,1857-1936
- Pearson, Leonard,1868-1909
- Pearson, Raymond A.1873-1939
- Pearson, T. Gilbert1873-1943
- Peary, Robert E.1856-1920
- Peattie, Donald Culross,1898-1964
- Pecan, Erene V.
- Pechaud, Jean.
- Pechuël-Loesche, Eduard,1840-1913
- Peck, Charles H.1833-1917
- Peck, William Dandridge,1763-1822
- Peckham, Elizabeth (Gifford),1854-
- Peckham, Elizabeth Gifford,1854-
- Peckham, George Williams,1845-1914
- Peet, Edmond N.,
- Peet, Max Minor,1885-
- Peeters, Johannes Leonardis Elbertus.
- Pellegrin, Jacques,1873-1944
- Pelletan, Jules,1833-
- Pellett, Frank Chapman,1879-1951
- Pelseneer, Paul,1863-
- Pelt Lechner, A. A. van.
- Pelzeln, August von,1825-1891
- Pelzeln, August von.
- Pembrey, M. S.1868-1934
- Pena, Pierre,fl. 1535-1605
- Penard, Arthur Philip
- Penard, Eugène,1855-1954
- Penard, Frederik Paul
- Péneau, J.
- Penhallow, D. P.1854-1910
- Pennant, Thomas,1726-1798
- Pennington, Arthur S. (Arthur Stuart)
- Pennsylvania College.Linnaean Association.
- Pennsylvania Horticultural Society.
- Pennsylvania State University.Biophysics Dept.
- Pennsylvania.Dept. of Agriculture.
- Pennsylvania.Ornithologist.
- Pennsylvania.State Board of Agriculture.
- Penzig, O.1856-1929
- Pepper, Beverly
- Péragallo, H.1851-
- Péragallo, M.1853-
- Percheron, A.1797-1869
- Percy Sladen Trust Expedition to the Indian Ocean(190-)
- Percy, Mabel Rice.
- Pérée, A.,
- Pérez, Charles,1873-
- Pérez, Tila M.
- Périaux, ?,fl. 1850.-
- Périer, L.
- Péringuey, Louis.
- Perkins, George H,1844-1933
- Perkins, George H.1844-1933
- Perkins, George Henry,1844-1933
- Perkins, Janet R.1853-1933
- Perkins, Philip D.
- Perkins, R. C. L.1866-1955
- Perleb, Karl Julius,1794-1845
- Perlmutter, Alfred.
- Perlzweig, William Alexander,1891-
- Perner, Jaroslav,1869-
- Pernotin, B.
- Péron, Alphonse,1834-1908
- Perrier, Edmond,1844-1921
- Perrine, Henry,1797-1840
- Perring, W.
- Perrottet, G. S.1793-1870
- Perry, Louise Merrimon,1878-
- Perry, Matthew Calbraith,1794-1858
- Perry, W. A.
- Persoon, C. H.1755-1837
- Persyn, Reinier van,1614-1668
- Perthshire Society of Natural Science.
- Perugia, Alberto.
- Pesta, Otto,1885-
- Pesta, Otto.
- Petényi, János Salamon,1799-1855
- Peter Schoeffer.
- Petermann, Wilhelm Ludwig,1806-1855
- Peters, James Arthur,1922-
- Peters, James Lee,1889-1952
- Peters, Wilhelm C. H.1815-1883
- Petersen, C. G. Joh.1860-1928
- Petersen, Niels Frederick,1877-
- Peterson, Alvah,1888-
- Peterson, Chr.
- Peterson, Maude Gridley,1871-
- Peterson, Peter Magnus.
- Peterson, William Harold,1880-
- Petit de La Saussaye, S.
- Petit, Antoine,1843
- Petit, Paul Charles Michel.1833-
- Petit, Paul,1834-1913
- Petiver, James,1663 or 4-1718
- Petri, Karl.
- Petroff, Ivan,1842-
- Petrunkevitch, Alexander,1875-1964
- Petterd, W. F.
- Pettersson, Hans,1888-
- Petunnikov, A. N.1842-1919
- Pewtress & Co.
- Peyerimhoff, Henri de,1838-1877
- Peytoureau, S. Alban.
- Pfeffer, G.1854-1931
- Pfeffer, Georg Johann,1854-
- Pfeffer, Georg Johann,1854-1931
- Pfeffer, W.1845-1920
- Pfefferkorn, Hermann W.
- Pfeiffer, L.1842-1921
- Pfeiffer, Louis,1805-1877
- Pfeiffer, Ludovico,1805-1877
- Pfeiffer, Ludwig Georg Karl,1805-1877
- Pfeiffer, Norma Etta.
- Pfeiffer, Richard.
- Pfeil, W.1783-1859
- Pfenning, Johann Caspar.
- Pfleiderer, I.
- Pflieger, William L.
- Phelps, Lincoln,1793-1884
- Philadelphia Society for Promoting Agriculture.
- Philip Miller.
- Philip, Cornelius Becker,1900-
- Philippe, Xavier,1802-1866
- Philippi, Federico,1838-1910
- Philippi, R. A.1808-1904
- Philippi, Rodolfo Amando,1808-1904
- Philippines.Bureau of Agriculture.
- Philippines.Bureau of Government Laboratories.
- Philippines.Bureau of Science.
- Philippines.National Science Development Board.
- Philipps-Universität Marburg.
- Phillippe, Loy R.
- Phillipps, Evelyn March,d. 1915.-
- Phillips, Claude Ellis,1900-
- Phillips, Edward Cambridge,1840-
- Phillips, Everett Franklin,1878-1951
- Phillips, Henry,1775-1838
- Phillips, Henry,1801-1876
- Phillips, William,1822-1905
- Phillott, D. C.1860-1930
- Philosophical Institute of Canterbury (Christchurch, N.Z.)
- Philosophical Society of Glasgow.
- Philpots, John Richards.
- Phipps, Constantine John,1744-1792
- Phipson, T. L.1833-1908
- Phisalix, Marie,1861-
- Phycological Society of America.
- Physikalisch-Ökonomische Gesellschaft zu Königsberg.
- Physiographiska Sallskapet i Lund
- Physiographiska Sallskapet i Lund.
- Physiographiske forening i Christiania.
- Phytopathologisch Laboratorium "Willie Commelin Scholten."
- Pia y Peuela, Ramn.
- Pichard.
- Pichi-Sermolli, Rodolfo E. G.
- Pickard-Cambridge, O.
- Pickering, Quentin H
- Pictet, Camille.
- Pictet, François Jules,1809-1872
- Pidgeon, Edward.
- Pidsley, William E. H.
- Piel (Island).Sea-fish hatchery.
- Piepers, M. C.1835-1919
- Pierantoni, Umberto,1876-
- Pierce, Frank Nelson.
- Pierce, W. Dwight1881-1967
- Piéri, J.-B.
- Pierre, L.1833-1905
- Piersig, Gustav Richard,1857-
- Piersig, R.
- Piersol, George A.
- Pieter van der Aa.
- Pietsch, Lysle R.
- Piette,
- Pilger, Robert Knuds Friedrich,1876-1953
- Pillain, Augustin.
- Pillsbury, George Bigelow,1876-
- Pilsbry, Henry Augustus,1862-
- Pimentel, Richard A.
- Pinchot, Gifford,1865-1946
- Pincus, Gregory,1903-1967
- Piney, A.1896-
- Pingré, Alexandre Guy,1711-1796
- Pini, Napoleone.
- Pinna, Mário C. C. de
- Pinter, Helmut.
- Piper, Charles V.1867-1926
- Piper, Hans Edmund,1877-
- Piper, Hugh.
- Piper, Robert G.
- Piré, Louis,1827-1887
- Pirona, Giulio Andrea,1822-1895
- Pirotam et Masperum.
- Pirotta, Romualdo,1853-1936
- Pisarri, Carlo Antonio,ca 1-20
- Pisarri, Carlo,
- Piso, Willem,1611-1678
- Pitelka, Dorothy R.1920-
- Pittier, Henri,1857-1950
- Planchon, J. E.1823-1888
- Planchon, J.-E.1823-1888
- Planchon, Louis,1858-1915
- Plankton Expedition(188-)
- Plant Nematology Workshop1954-:
- Plant World Association.
- Plantijnsche Drukkerij
- Plantin, Christophe,ca. 1520-1589
- Plantiniana (Ex Officina)
- Plate, Ludwig,1862-1937
- Playfair, R. Lambert1828-1899
- Plée, François,
- Plenck, Joseph Jacob,1738-1807
- Pleske, F. D.1858-1932
- Pliny,
- Pliny,
- Plön (Germany).Biologische Station.
- Plowman, Timothy.
- Plowright, Charles Bagge,1849-1910
- Plucar, Ernst.
- Plues, Margaret.
- Plumb, Charles S.1860-1939
- Plumier, Charles,1646-1704
- Pocci, Franz von,
- Pocock, R. I.1863-1947
- Pocock, Reginald Innes,1863-1947
- Pocock, Roger S.,1865-
- Pocta, Filip,1859-
- Poe, Edgar Allan,1809-1849
- Poeppig, Eduard Friedrich,1798-1868
- Poey, Felipe,1799-1891
- Pohl, Johann Emanuel,1782-1834
- Pohl, Richard Walter,1916-
- Pohlig, Hans.
- Poiret, A.,
- Poiret, Jean Louis Marie,1755-1834
- Poirier, Henry Pierre,1886-
- Poirier, M. J.
- Poisson, Henri.
- Poiteau, A.1766-1854
- Poland, Henry.
- Polet, C. B.
- Poliakov, G. I.
- Policard, A.1881-1972
- Polimanti, Osvaldo.
- Poljakov, G. I.
- Pollard, Ernest C.1906-
- Pollen, Francois P. L.
- Pollonera, Carlo.
- Polowzow, Warwara,1877-
- Polska Akademia Umiejtnoci.
- Polska Akademia Umiejtnoci.Wydzia Matematyczno-Przyrodniczy.
- Polski Zwiazek Entomologiczny.
- Polskie Towarzystwo Entomologiczne.
- Polskie Towarzystwo Przyrodników im. Kopernika.Sekcja Entomologiczna.
- Polunin, Nicholas.
- Polyak, Stephen Lucian,1889-1955
- Pomel, A.1821-1898
- Pomona College (Clarement, Calif.).Dept. of Biology.
- Pomona College (Claremont, Calif.).Dept. of Biology.
- Pomona College (Claremont, Calif.).Dept. of Zoology.
- Pomona College (Claremont, Calif.).Laguna Marine Laboratory.
- Pomona College.Dept. of Biology.
- Pomono College (Claremont, Calif.).Dept. of Biology.
- Pompecki, Josef Felix,1867-
- Pona, Giovanni,1565-1630
- Ponce de Leon, José.
- Ponce de Leon, Patricio.
- Ponte, Eduardo del
- Pontén, Peter Carl,1802-1857
- Poole, Robert W.
- Poor, Charles Lane,1866-
- Poot, Abraham van,b. ca. 1617.-
- Pope, Clifford H.1899-1974
- Pope, Clifford Hillhouse,1899-
- Pope, Sarah Haydock (Davis)
- Popenoe, Paul Bowman,1888-
- Popenoe, Wilson,1892-1975
- Poppius, B.
- Poppius,B.1876-1916
- Porcher, Francis Peyre,1825-1895
- Porras, Louis.
- Porritt, George Taylor,1848-
- Porro, Carlo
- Porsild, A. E.1901-
- Porsild, Morten P.1872-1956
- Porter, John Hampden.
- Porter, Thomas Conrad,1822-1901
- Portier, Paul Jules,1866-
- Portis, Alessandro.
- Portland Society of Natural History (Me.)
- Portland Society of Natural History (Me.),
- Portugal Academia Real das Sciencias.
- Poscharsky, Gustav Adolf,1832-
- Posey, Chesley Johnston,1906-
- Posner, Michael I.
- Post, George E.1838-1909
- Post, Thomas Erik von,1858-1912
- Postal Microscopical Society.
- Postel, Emil.
- Potanin, G. N.1835-1920
- Poteau, J.,fl 1-76
- Potiez, Valéry Louis Victor.
- Potonié, H.1857-1913
- Potter, George Edwin,1898-
- Potter, Michael Cresse.
- Pottier.
- Potts, Edward.
- Potts, F. A.
- Potts, George.
- Pouchet, F.-A.1800-1872
- Pouchet, G.1833-1894
- Poujade, G.-A.
- Poulsen, Christian Marinus,1818-1885
- Poulton, Edward Bagnall,1856-1943
- Pourtalès, Louis Francois de,1824-1880
- Pousargues, Eugène de.
- Pouzolz, Pierre Casimir Marie de,1785-1858
- Powell, John Wesley,1834-1902
- Power, F. D.
- Power, Frederick B.1853-1927
- Poynting, Frank,1848-1897
- Praeger, R. Lloyd1865-1953
- Prague (Czechoslovakia).Oba komitéty propr̆irodovĕdecký výskum zemĕ C̆eské.
- Prahl, P.1843-1911
- Praktische Gartenbau-Gesellschaft im Bayern zu Frauendorf.
- Pramuk, Jennifer B.
- Prantl, Karl Anton Eugen,1849-1893
- Pratt, Anne,1806-1893
- Pratt, Henry Sherring,1859-
- Pratt, Ivan.
- Pratten, Mary A.
- Pray, Leon Luther,1882-
- Pre-1801 Imprint Collection (Library of Congress)
- Preble, Edward Alexander,1871-1957
- Pregill, Gregory K.
- Preiss, Ludwig.
- Preiss, Paul.
- Preissler, Johann Justin,1698-1771
- PreÌvost, Florent.
- Prell, Heinrich.
- Preller, C. H.
- Prenant, Marcel,1893-
- Prescott, G. W.1899-
- Presl, Karel Bořiwog,1794-1852
- Press, J. R.
- Presso di Giordano Ziletti.
- Prestele, Joseph.
- Prestoe, Henry.
- Preston, Henry C.
- Preston, Hugh Berthon.
- Preston, R. D.
- Preston, Richard Joseph,1905-
- Preudhomme de Borre, Alfred.
- Preusse, Franz.
- Preussische Akademie der Wissenschaften
- Preussische expedition nach Ost-Asien,(186--186
- Preussische Geologische Landesanstalt.
- Prevost fils (Firm)
- Prévost, Benoît Louis,ca 1-35-1
- Preyer, William T.,1841-1897
- Price, Roger D.
- Prime, T.
- Prince, Edward Ernest,1858-
- Princeton University Expeditions to Patagonia,(189--189
- Princeton University Expeditions to Patagonia, 1896-1899.
- Princeton University.
- Princeton University.Bird Club.
- Pringsheim, Ernst G.1881-
- Pringsheim, N.1823-1894
- Prior, Sophia.
- Pritchard, Andrew,1804-1882
- Pritchard, Arthur Earl,1915-
- Pritzel, G. A.1815-1874
- Procopianu-Procopovici, Aurel.
- Procter, William,1872-1951
- Proctor brothers, Gloucester, Mass., pub.
- Proefstation voor de Java-Suikerindustrie.
- Pronville, Auguste de.
- Prosser, C. Ladd1907-
- Provancher, L.1820-1892
- Prowazek, S. von1875-1915
- Prudden, T. M.
- Prussia.Kommission zur Wissenschaftlichen Untersuchung der Deutschen Meere in Kiel.
- Prytz, Lars Johan,1789-1823
- Przhevalʹskiĭ, Nikolaĭ Mikhaĭlovich,1839-1888
- Przibram, Hans,1874-
- Przibram, Hans.
- Psilander, Fredrik Christopher,1785-1834
- Public Library, Museum, and Art Gallery of South Australia.
- Pucci, Angiolo,1851-
- Puel, Timothée,1812-1890
- Puerto Rico.Board of Commissioners of Agriculture.
- Puget Sound Biological Station.
- Puget Sound Marine Station
- Pugh, Evan,1828-1864
- Pugh, Griffith Thompson.
- Puiggari, Juan Ignacio,1823-1900
- Pulle, A.1878-1955
- Pulst, Carl Wilhelm,1868-
- Punnett, Reginald Crundall,1875-
- Purbeck Society.
- Pursh, Frederick,1774-1820
- Pusch, G. ustavi.e. Julius Gustav.
- Puthz, Volker
- Puton, A.1834-1913
- Putzeys, Jules Antoine Adolphe Henri,1809-1882
- Pycraft, W. P.
- Pycraft, W. P.1868-1942
- Pycraft, William Playne.
- Pyle, Robert,1877-1951
- Pymatuning Laboratory of Field Biology.
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