Memorias de la Real Academia de Ciencias Exactas, Fisicas y Naturales de Madrid - Real Academia de Ciencias Exactas Físicas y Naturales de Madrid. (Impr. Aguado, 1906)

Memorias de la Real Academia de Ciencias Exactas, Fisicas y Naturales de Madrid - Real Academia de Ciencias Exactas Físicas y Naturales de Madrid. (Impr. Aguado, 1907)

Memorias do Museu Bocage - Museu e Laboratório Zoológico e Antropológico (Portugal) (Impr. Libanio da Silva, 1909)

Memorie - Classe di scienze fisiche, matematiche e naturali - Accademia nazionale dei Lincei. Classe di scienze fisiche, matematiche e naturali. (Accademia Nazionale dei Lincei, 1877)

Memorie della Reale accademia delle scienze di Torino - Accademia delle scienze di Torino (Stamperia reale, 1849)

Memorie della Reale accademia delle scienze di Torino - Accademia delle scienze di Torino (Stamperia reale, 1854)

Memorie della Reale accademia delle scienze di Torino - Accademia delle scienze di Torino (Stamperia reale, 1861)

Memorie di matematica e di fisica della Societ`a italiana delle Scienze - Società Italiana delle Scienze. (Società Italiana delle Scienze, 1825)

Der Mensch - Ranke, Johannes, 1836 -1916 (Bibliographisches Institut, 1886)

Merveilles de la nature : les insectes, les myriopodes, les arachnides et les crustaces - Brehm, Alfred Edmund, 1829 -1884 (J.-B. Baillière et Fils, 49 rue Hautefeuille, près du boulevard Saint-Germain, 1882)

De metamorphosi eleutheratorum observationes : bidrag til insekternes udviklingshistorie - Schiødte, J. C. (Jørgen Matthias Christian), 1815 -1884 (Thieles Bogtrykkeri, 1870)

De metamorphosi eleutheratorum observationes : bidrag til insekternes udviklingshistorie - Schiødte, J. C. (Jørgen Matthias Christian), 1815 -1884 (Thieles Bogtrykkeri, 1861)

Meyers Konversations-Lexikon : eine Encyklopädie des allgemeinen Wissens - Meyer, Hermann Julius, 1826 -1909 (Verlag des Bibliographischen Instituts, 1890)

The micrographic dictionary; a guide to the examination and investigation of the structure and nature of microscopic objects - Berkeley, M. J. (Miles Joseph), 1803 -1889 (J. Van Voorst, 1875)

The micrographic dictionary; a guide to the examination and investigation of the structure and nature of microscopic objects - Berkeley, M. J. (Miles Joseph), 1803 -1889 (J. Van Voorst, 1883)

The micrographic dictionary; a guide to the examination and investigation of the structure and nature of microscopic objects - Griffith, J. W. (John William) (John Van Voorst, 1856)

The microscope and its revelations - Carpenter, William Benjamin, 1813 -1885 (P. Blackiston's Sons and Co, 1901)

The microscopist : a compendium of microscopic science including the use of the microscope, mounting and preserving microscopic objects, the microscope in chemistry, biology, histology, botany, geology, pathology, etc - Wythe, J. H. (Joseph Henry), 1822 -1901 (P. Blakiston, Son & Co, 1883)

The microscopist : a manual of microscopy and compendium of the microscopic sciences - Wythe, J. H. (Joseph Henry), 1822 -1901 (Lindsay & Blakiston, 1880)

The microtomist's vade-mecum : a handbook of the methods of microscopic anatomy - Lee, Arthur Bolles, 1849 -1927 (P. Blakiston, Son & Co, 1896)

The microtomist's vade-mecum; a handbook of the methods of microscopic anatomy - Lee, Arthur Bolles, 1849 -1927 (P. Blakiston's Son & Co, 1900)

The microtomist's vade-mecum; a handbook of the methods of microscopic anatomy - Lee, Arthur Bolles, 1849 -1927 (P. Blakiston's son & co, 1904)

Midden-Sumatra. Reizen en onderzoekingen der Sumatra-expeditie, uitgerust door het Aardrijkskundig genootschap, 1877-1879, beschreven door de leden der expeditie, onder toezicht van Prof. P.J. Veth - Veth, Pieter Johannes, 1814 -1895 (E.J. Brill, 1881)

Midden-Sumatra. Reizen en onderzoekingen der Sumatra-expeditie, uitgerust door het Aardrijkskundig genootschap, 1877-1879, beschreven door de leden der expeditie, onder toezicht van Prof. P.J. Veth - Veth, Pieter Johannes, 1814 -1895 (E. J. Brill, 1881)

Midland naturalist - Birmingham Natural History; Microscopical Society (Birmingham, England) (Hardwicke and Bogue, 1878)

The migrations of animals from sea to land - Pearse, A. S. (Arthur Sperry), 1877 -1956 (Duke university press, 1936)

Mikrogeologie : das Erden und Felsen schaffende Wirken des unsichtbar kleinen selbständigen Lebens auf der Erde - Ehrenberg, Christian Gottfried, 1795 -1876 (L. Voss, 1854)

Miscellanea Curiosa Medico-Physica Academiae Naturae Curiosorum - Kaiserlich Leopoldinisch-Carolinische Deutsche Akademie der Naturforscher (1670)

Mitteilungen aus dem Naturhistorischen Museum in Hamburg - Naturhistorisches Museum in Hamburg. (Lütcke & Wulff, 1897)

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Mitteilungen aus dem Naturhistorischen Museum in Hamburg - Naturhistorisches Museum in Hamburg. (Lütcke & Wulff, 1916)

Mitteilungen aus dem Naturhistorischen Museum in Hamburg - Naturhistorisches Museum in Hamburg. (Lütcke & Wulff, 1917)

Mitteilungen aus dem Naturwissenschaftlichen Verein für Neuvorpommern und Rügen in Griefswald ... - Naturwissenschaftlicher Verein für Neuvorpommern und Rügen, Greifswald. (1869)

Mitteilungen der Schweizerischen Entomologischen Gesellschaft = Bulletin de la Société entomologique suisse - Schweizerische Naturforschende Gesellschaft. (Schweizerische Entomologische Gesellschaft, 1874)

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Mitteilungen des Naturwissenschaftlichen Vereines für Steiermark - Molisch, Hans, 1856 -1937 (1886)

Mittheilungen aus der Zoologischen Station zu Neapal - Stazione zoologica di Napoli. (Wilhelm Engelmann, 1878)

Mittheilungen aus der Zoologischen Station zu Neapal - Stazione zoologica di Napoli. (Wilhelm Engelmann, 1891)

Mittheilungen aus der Zoologischen Station zu Neapal - Stazione zoologica di Napoli. (Wilhelm Engelmann, 1895)

Mollusca & shells - Gould, Augustus A. (Augustus Addison), 1805 -1866 (Printed by C. Sherman, 1856)

Mollusca testacea marium britannicorum : a history of the British marine testaceous Mollusca distributed in their natural order, on the basis of the organization of the animals : with references and notes on every British species - Clark, William, of Bath. (J. Van Voorst, 1855)

Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin - Königlich Preussische Akademie der Wissenschaften zu Berlin (Königliche Akademie der Wissenschaften, 1857)

Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin - Königlich Preussische Akademie der Wissenschaften zu Berlin (Königliche Akademie der Wissenschaften, 1858)

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A monograph of the British fossil Crustacea, belonging to the order Merostomata - Woodward, Henry, 1832 -1921 (Printed for the Palæontographical Society, 1866)

A monograph of the Culicidae, or mosquitoes. Mainly compiled from the collections received at the British museum from various parts of the world in connection with the investigation into the cause of malaria conducted by the Colonial office and the Royal society - British Museum (Natural History). Department of Zoology. (Printed by order of the Trustees, 1901)

Monograph of the Palaeontographical Society - Palaeontographical Society (Great Britain) (Printed for the Palaeontographical Society, 1878)

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Monographs on the Isopods of North America - Richardson, Harriet (Govt. print. off, 1905)

Monthly microscopical journal: transactions of the Royal Microscopical Society, and record of histological research at home and abroad - Royal Microscopical Society (Great Britain) (R. Hardwicke, 1869)

Monthly microscopical journal: transactions of the Royal Microscopical Society, and record of histological research at home and abroad - Royal Microscopical Society (Great Britain) (R. Hardwicke, 1873)

Morphologisches Jahrbuch (Wilhelm Engelmann, 1883)

Morphologisches Jahrbuch (Wilhelm Engelmann, 1876)

Mrs. Loudon's Entertaining naturalist, being popular descriptors, tales, and anecdotes of more than five hundred animals - Dallas, W. S. (William Sweetland), 1824 -1890 (Bell & Daldy, 1867)

Museum Boltenianum : Verzeichnis der von dem gestorbenen J.F. Bolten...hinterlassenen vortrefflichen Sammlung Conchylien, Mineralien und Kunstsachen die am 26. April d.J., Morgens um 10 Uhr öffentlich verkauft werden sollen durch den Makler J. Noodt - Bolten, Joachim Friedrich, 1718 -1796 (Conrad Müller, 1819)

Museum Normanianum, or A catalogue of the invertebrata of Europe, and the Arctic and North Atlantic oceans, which are contained in the collection of the Rev. Canon A. M. Norman, ... . I.-XII. Printed for private distribution - Norman, Alfred Merle 1831 -1918 (Morton, printer, 1886)

The museum of natural history; being a popular account of the structure, habits, and classification of the various departments of the animal kingdom: quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture - Holder, Joseph B. (Joseph Bassett), 1824 -1888 (J. S. Virtue, 1877)

The museum of natural history, with introductory essay on the natural history of the primeval world : being a popular account of the structure, habits, and classification of the various departments of the animal kingdom, quadrupeds, birds, reptiles, fishes, shells, and insects, including the insects destructive to agriculture - White, Adam, 1817 -1879 (William MacKenzie, 1869)

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Name that animal; a guide to the identification of the common land and fresh-water animals of the United States, with special reference to the area east of the Rockies - Driver, Ernest Charles, 1899 - (1950)