Memórias do Instituto Butantan - Instituto Butantan (O Instituto, 1991)

Memórias do Museu Goeldi (Museu Paraense) de História Natural e Ethnographia (O Museu, 1896)

Memorias y revista de la Sociedad Científica "Antonio Alzate." - Sociedad Científica "Antonio Alzate." (Imprenta del Gobierno en el Ex-Arzobispado, 1899)

Memorie della Reale accademia delle scienze di Torino - Accademia delle scienze di Torino (Stamperia reale, 1884)

Meyers Konversations-Lexikon : ein Nachschlagewerk des allgemeinen Wissens - Meyer, Hermann Julius, 1826 -1909 (Bibliographisches Institut, 1896)

Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1952)

Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1956)

Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1971)

Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1974)

Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1978)

Miscellaneous publication - University of Kansas, Museum of Natural History - University of Kansas. Museum of Natural History. (University of Kansas, 1981)

Miscellaneous publications - University of Michigan. Museum of Zoology. (The University, 1916)

Mitteilungen aus dem Naturhistorischen Museum in Hamburg - Naturhistorisches Museum in Hamburg. (Lütcke & Wulff, 1901)

Mitteilungen aus der zoologischen Sammlung des Museums für Naturkunde in Berlin - Museum für Naturkunde in Berlin. (In Kommission bei R. Friedländer, 1900)

Mitteilungen des Naturwissenschaftlichen Vereines für Steiermark - Molisch, Hans, 1856 -1937 (1883)

Monitore zoologico italiano - Unione zoologica italiana. (Instituto anatomico della R. Università di Siena, 1897)

Monogenetic trematodes : their systematics and phylogeny - Bykhovskiĭ, B. E. (Boris Evseevich), 1908 -1974 (American Institute of Biological Sciences, 1961)

Montana amphibian and reptile status assessment, literature review, and conservation plan - United States. Bureau of Land Management. (Montana Natural Heritage Program, 2009)

Montana wildlife - Montana. Dept. of Fish; Game. Information-Education Division. (The Division, 1970)

Museum paper - Geological Survey of Alabama. Museum. (1910)

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)

Naturae novitates : Bibliographie neuer Erscheinungen aller Länder auf dem Gebiete der Naturgeschichte und der exacten Wissenschaften (R. Friedländer & Sohn, 1895)

Naturae novitates : Bibliographie neuer Erscheinungen aller Länder auf dem Gebiete der Naturgeschichte und der exacten Wissenschaften (R. Friedländer & Sohn, 1897)

Naturae novitates : Bibliographie neuer Erscheinungen aller Länder auf dem Gebiete der Naturgeschichte und der exacten Wissenschaften (R. Friedländer & Sohn, 1907)

Natural history - American Museum of Natural History (1923)

Natural history - American Museum of Natural History (American Museum of Natural History, 1919)

Natural history - Lydekker, Richard, 1849 -1915 (Hutchinson, 1897)

Natural history in zoological gardens; being some account of vertebrated animals, with special reference to those usually to be seen in the Zoological society's gardens in London and similar institutions - Beddard, Frank E. (Frank Evers), 1858 -1925 (A. Constable & co., ltd, 1905)

The natural history of animals: the animal life of the world in its various aspects and relations - Ainsworth-Davis, J. R. (James Richard), 1861 -1934 (The Gresham Publishing Company, 1903)

Natural history of the wood frog (Rana sylvatica) in the Shawnee National Forest, southern Illinois - Illinois. Natural History Survey Division (Illinois Natural History Survey, 2002)

Natural history of Victoria : prodromus of the zoology of Victoria; or figures and descriptions of the living species of all classes of the Victorian indigenous animals - McCoy, Frederick, 1817 -1899 ([John Ferres, Government Printer], 1885)

Natural history of Victoria : Prodromus of the zoology of Victoria, or, figures and descriptions of the living species of all classes of the Victorian indigenous animals - McCoy, Frederick, 1817 -1899 (By authority: J. Ferres, government printer, 1881)

The natural history review - Belfast Natural History; Philosophical Society. (Hodges & Smith, 1856)

Nature - Lockyer, Norman, Sir, 1836 -1920 (Macmillan Journals Ltd., etc, 1911)

Nature - Lockyer, Norman, Sir, 1836 -1920 (Macmillan Journals Ltd., etc, 1914)

Naturgeschichte der Lurche. (Amphibiologie) - Knauer, Friedrich K. (Friedrich Karl), 1850 -1926 (A. Pichler's Witwe & Sohn, 1883)

Die Naturwissenschaften - Gesellschaft Deutscher Naturforscher und Ärzte. (Springer-Verlag, 1913)

Naturwissenschaftliche Wochenschrift - Deutsche Gesellschaft für Volkstümliche Naturkunde in Berlin. (G. Fischer [etc.], 1897)

Naturwissenschaftliche Wochenschrift - Deutsche Gesellschaft für Volkstümliche Naturkunde in Berlin. (G. Fischer [etc.], 1914)

A new cryptic species of microhylid frog (genus Cophixalus) from Papua New Guinea, with notes on related forms - Zweifel, Richard George, 1926 -2019 (American Museum of Natural History, 1979)

A new frog from an Eocene oil-well core in Nevada - Hecht, Max K., 1925 - (American Museum of Natural History, 1960)

New frogs from Misiones and Uruguay - Schmidt, Karl Patterson, 1890 -1957 (1944)

A new genus of microteiid lizard from the Caparaó Mountains, southeastern Brazil, with a discussion of relationships among Gymnophthalminae (Squamata) - Pavan, Dante (American Museum of Natural History, 2009)

A new herpetofauna from Cerro Yaví, Venezuela : first results of the Robert G. Goelet American Museum-Terramar Expedition to the northwestern tepuis - Myers, Charles W. (American Museum of Natural History, 1996)

The New Mexico botanist - New Mexico State University. Cooperative Extension Service. (Range Science Herbarium and Cooperative Extension Service, 2010)

A new species of Hyla from Cerro Colorado, and other tree frog records and geographical notes from western Panama - Myers, Charles W. (American Museum of Natural History, 1982)

A new species of Marmosops (Marsupialia, Didelphidae) from the Pakaraima Highlands of Guyana, with remarks on the origin of the endemic Pantepui mammal fauna - Lim, Burton K. (American Museum of Natural History, 2013)

A new species of marsupial frog (Anura: Hylidae: Gastrotheca) from the Cordillera Azul in Peru - Lehr, Edgar (Natural History Museum, University of Kansas, 2001)

A new species of microhylid frog, genus Oreophryne, from Papua New Guinea - Zweifel, Richard George, 1926 -2019 (American Museum of Natural History, 2003)

New species of stream-breeding hylid frogs from the northern versant of the highlands of Oaxaca, Mexico - Campbell, Jonathan A. (Natural History Museum, University of Kansas, 2000)

The North Queensland Naturalist : the journal and magazine of the North Queensland Naturalist Club - North Queensland Naturalists' Club. (The Club, 1978)

The North Queensland Naturalist : the journal and magazine of the North Queensland Naturalist Club - North Queensland Naturalists' Club. (The Club, 1984)

North Queensland Naturalists Club - North Queensland Naturalists' Club. (North Queensland Naturalists Club, 1993)

Northern leopard frog reintroduction : Raven River - year 2 (2000) - Alberta. Fish; Wildlife Division. (Alberta Sustainable Resource Development, Fish & Wildlife Division, Resource Status and Assessment Branch, 2001)

Northern Territory Naturalist - Northern Territory Field Naturalists' Club (, Northern Territory Field Naturalists' Club, 1981)

Northern Territory Naturalist - Northern Territory Field Naturalists' Club (, Northern Territory Field Naturalists' Club, 2007)

Northern Territory Naturalist - Northern Territory Field Naturalists' Club (, Northern Territory Field Naturalists' Club, 2013)

Notes from the Leyden Museum - Rijksmuseum van Natuurlijke Historie te Leiden. (E.J. Brill, 1883)

Notes from the Leyden Museum - Rijksmuseum van Natuurlijke Historie te Leiden. (E.J. Brill, 1879)

Nova Caledonia. Forschungen in Neu-Caledonien und auf den Loyalty-Inseln. Recherches scientifiques en Nouvelle-Calédonie et aux iles Loyalty. A. Zoologie - Sarasin, Fritz, 1859 -1942 (C.W. Kreidel, 1913)

Nova Guinea : résultats de l'expédition scientifique néerlandaise à la Nouvelle-Guinée ... - Beaufort, L. F. de (Lieven Ferdinand), 1879 -1968 (E.J. Brill, 1906)

Nova Guinea : résultats de l'expédition scientifique néerlandaise à la Nouvelle-Guinée ... - Beaufort, L. F. de (Lieven Ferdinand), 1879 -1968 (E.J. Brill, 1917)

Nova Guinea : résultats de l'expédition scientifique néerlandaise à la Nouvelle-Guinée ... - Beaufort, L. F. de (Lieven Ferdinand), 1879 -1968 (E.J. Brill, 1909)

Occasional papers from the Museum of Victoria. Vol. 1-6 (1984-1993) - Museum of Victoria (Council of the Museum of Victoria, 1992)

Occasional papers of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1921)

Occasional papers of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1904)

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, 1973)

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, 2010)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2012)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2013)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1971)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1972)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1973)