Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1970)

Mission scientifique au Mexique et dans l'Amérique Centrale : ouvrage publié par ordre de S.M. l'Empereur et par les soins du Ministre de l'instruction publique - Fournier, Eugène, 1834 -1884 (Imprimerie impériale, 1868)

Mission scientifique au Mexique et dans l'Amérique Centrale : ouvrage publié par ordre de S.M. l'Empereur et par les soins du Ministre de l'instruction publique - Fournier, Eugène, 1834 -1884 (Imprimerie impériale, 1900)

Mitteilungen der Botanischen Staatssammlung München - Botanische Staatssammlung München. (H. Merxmüller, 1971)

Mollusca für 1901-1904 : geographische Verbreitung, Systematik und Biologie - Kobelt, Wilhelm, 1840 -1916 (Nicolai?, 1905)

Monatsschrift für Kakteenkunde (J. Neumann, 1897)

Monatsschrift für Kakteenkunde (J. Neumann, 1900)

Monatsschrift für Kakteenkunde (J. Neumann, 1906)

Monatsschrift für Kakteenkunde (J. Neumann, 1908)

Monatsschrift für Kakteenkunde (J. Neumann, 1910)

Monografia del venado Bura o cola prieta (odocoileus hemionus canus Mearns) - Mexico. Dirección de Estudios Biológicos. (Imp. de la direccion de estudios biologicos, 1922)

Monographia heliceorum viventium : sistens descriptiones systematicas et criticas omnium huius familiae generum et specierum hodie cognitarum - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (Brockhaus, 1876)

Monographia heliceorum viventium : sistens descriptiones systematicas et criticas omnium huius familiae generum et specierum hodie cognitarum - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (Brockhaus, 1877)

Monographia heliceorum viventium : sistens descriptiones systematicas et criticas omnium hujus familiae generum et specierum hodie cognitarum / auctore Ludovico Pfeiffer - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (1868)

Monographia heliceorum viventium : sistens descriptiones systematicas et criticas omnium hujus familiae generum et specierum hodie cognitarum / auctore Ludovico Pfeiffer - Pfeiffer, Louis (Ludwig Georg Karl), 1805 -1877 (1877)

A monographic revision of the Coleoptera belonging to the Tenebrionide tribe Eleodiini inhabiting the United States, lower California, and adjacent islands - Blaisdell, Frank E. (Frank Ellsworth), 1862 -1946 (Govt. print. off, 1909)

Monographs of North American rodentia - Coues, Elliott, 1842 -1899 (G.P.O, 1877)

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)

Die Natur - Müller, Karl, 1818 -1899 (G. Schwetschke, 1852)

A natural history of the British Lepidoptera : a text-book for students and collectors - Tutt, James William, 1858 -1911 (S. Sonnenschein, 1904)

A natural history of the ducks - Fuertes, Louis Agassiz, 1874 -1927 (Houghton Mifflin Company, 1923)

Natural science (Macmillan & Co, 1893)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1874)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1880)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1882)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1885)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1887)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1891)

La naturaleza; periódico científico del Museo Nacional de Historia Natural y de la Sociedad Mexicana de Historia Natural - Sociedad Mexicana de Historia Natural. (Impr. de I. Escalante, 1910)

Naturalist's guide to the Americas - Ecological Society of America. Committee on the Preservation of Natural Conditions. (Williams & Wilkins, 1926)

Nature and science on the Pacific coast : a guide-book for scientific travelers in the West - American Association for the Advancement of Science. Pacific Coast Committee. (P. Elder, 1915)

Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet - Engler, Adolf, 1844 -1930 (W. Engelmann, 1887)

The Nautilus - American Malacologists, Inc. (American Malacologists, inc., etc, 1904)

The Nautilus - American Malacologists, Inc. (American Malacologists, inc., etc, 1967)

The Nautilus - American Malacologists, Inc. (American Malacologists, inc., etc, 1977)

Nests and eggs of North American birds - Davie, Oliver, 1857 -1911 (Landon Press, 1898)

Nests and eggs of North American birds - Davie, Oliver, 1857 -1911 (Hann & Adair, 1889)

Nests and eggs of North American birds - Davie, Oliver, 1857 -1911 (D. McKay, 1900)

Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde - Bronn, H. G. (Heinrich Georg), 1800 -1862 (E. Schweizerbart's Verlagshandlung, 1853)

Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde - Bronn, H. G. (Heinrich Georg), 1800 -1862 (E. Schweizerbart's Verlagshandlung, 1856)

Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde - Bronn, H. G. (Heinrich Georg), 1800 -1862 (E. Schweizerbart's Verlagshandlung, 1860)

New Central American snakes in the American Museum of Natural History - Dunn, E. R. (Emmett Reid), 1894 -1956 (American Museum of Natural History, 1928)

New North American fleas - Traub, Robert, 1916 -1996 (1944)

New York State Museum bulletin - New York State Museum. (University of the State of New York, 1944)

North American birds - National Audubon Society. (American Birding Association in alliance with the National Audubon Society, 2002)

North American fauna - U.S. Fish; Wildlife Service (Fish and Wildlife Service; for sale by the Supt. of Docs., U. S. Govt. Print. Off, 1909)

North American fauna - U.S. Fish; Wildlife Service (Fish and Wildlife Service; for sale by the Supt. of Docs., U. S. Govt. Print. Off, 1938)

North American flora - New York Botanical Garden (New York Botanical Garden, 1919)

The North American species of the genus ipomo͡ea - House, Homer D. (Homer Doliver), 1878 -1949 (1908)

Notes on the distribution of snakes in San Diego County, California - Klauber, Laurence Monroe, 1883 -1968 (Zoological Society of San Diego, 1924)

Noticia de la California, y de su conquista temporal, y espiritual hasta el tiempo presente - Venegas, Miguel, 1680 -1764 (En la imprenta de la viuda de Manuel Fernandez, y del Supremo consejo de la Inquisicion, 1757)

Nouveau dictionnaire d'histoire naturelle, appliquée aux arts, à l'agriculture, à l'économie rurale et domestique, à la médecine, etc (Chez Deterville, 1818)

Nova acta Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum - Kaiserlich Leopoldinisch-Carolinische Deutsche Akademie der Naturforscher (E. Blochmanni et Filii, 1900)

Occasional papers of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1901)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1922)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1928)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1953)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1971)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1983)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1984)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2003)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1860)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 1992)

Oikos= boletín del Centro de Ecología [UNAM] (Instituto de Ecología, UNAM, 2018)

On the flora of Australia : its origin, affinities, and distribution : being an introductory essay to the flora of Tasmania - Hooker, Joseph Dalton, 1817 -1911 (Lovell Reeve, 1859)

On the reptiles and batrachians - Garman, Samuel, 1843 -1927 (Printed for the Museum?, 1883)