Memórias do Instituto Butantan - Instituto Butantan (O Instituto, 1993)

Memórias do Instituto de Butantan - Instituto Butantan (Instituto Soroterápico "Butantan", 1918)

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)

Memorias y revista de la Sociedad Científica "Antonio Alzate." - Sociedad Científica "Antonio Alzate." (Imprenta del Gobierno en el Ex-Arzobispado, 1900)

Memorie della Reale accademia delle scienze di Torino - Accademia delle scienze di Torino (Stamperia reale, 1891)

The Merck/Merial manual for pet health - Kahn, Cynthia M., (Merck & Co, 2007)

Met een verhandeling over de verschijnselen en over de behandeling van giftigen slangenbeet - Ouwens, P. A. (E.J. Brill, 1916)

Meyers grosses konversations-lexikon. Ein nachschlagewerk des allgemeinen wissens. 2557142MC - Meyer, Hermann Julius, 1826 -1909 (Bibliographisches Institut, 1902)

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

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

Microbes & toxins - Scott, W. M (W. Heinemann, 1912)

Microbes & toxins - Broquet, Charles, 1876 -1964 (G. P. Putnam, 1912)

Mimikry und verwandte erscheinungen - Jacobi, Arnold, 1870 -1948 (F. Vieweg, 1913)

Miscellaneous notes and comments on toads, lizards, and snakes from Mexico - Conant, Roger, 1909 -2003 (American Museum of Natural History, 1965)

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, 1970)

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)

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

Mitteilungen aus dem Naturhistorischen Museum in Hamburg - Naturhistorisches Museum in Hamburg. (Lütcke & Wulff, 1908)

Mitteilungen aus dem Naturhistorischen Museum in Hamburg - Naturhistorisches Museum in Hamburg. (Lütcke & Wulff, 1884)

Mitteilungen aus dem Zoologischen Museum in Berlin - Zoologisches Museum in Berlin. (In Kommission bei R. Friedländer, 1908)

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)

Mitteilungen des Naturwissenschaftlichen Vereines für Steiermark - Molisch, Hans, 1856 -1937 (1887)

Mitteilungen des Naturwissenschaftlichen Vereines für Steiermark - Molisch, Hans, 1856 -1937 (1903)

Mitteilungen des Naturwissenschaftlichen Vereines für Steiermark - Molisch, Hans, 1856 -1937 (1902)

Monitore zoologico italiano - Unione zoologica italiana. (Instituto anatomico della R. Università di Siena, 1890)

Monitore zoologico italiano - Unione zoologica italiana. (Instituto anatomico della R. Università di Siena, 1916)

A monograph of Christmas Island (Indian Ocean) - British Museum (Natural History). Department of Geology. (Printed by order of the Trustees, 1900)

A monograph of lichens found in Britain; being a descriptive catalogue of the species in the herbarium of the British Museum - British Museum (Natural History). Department of Botany. (Printed by Order of the Trustees, 1894)

A monograph of the Mycetozoa, being a descriptive catalogue of the species in the herbarium of the British Museum. Illustrated with seventy-eight plates and fifty-one woodcuts - British Museum (Natural History). Department of Botany. (Printed by Order of the Trustees, Sold by Longmans [etc.], 1894)

A monograph of the Mycetozoa : a descriptive catalogue of the species in the Herbarium of the British Museum - British Museum (Natural History). Department of Botany. (Printed by order of the Trustees of the British Museum, 1911)

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

Morphological extremes–two new snakes of the genus Atractus from northwestern South America (Colubridae, Dipsadinae) - Myers, Charles W. (American Museum of Natural History, 2006)

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

Museum paper - Alabama Museum of Natural History. (Alabama Museum of Natural History, 1921)

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, 1893)

Naturae novitates : Bibliographie neuer Erscheinungen aller Länder auf dem Gebiete der Naturgeschichte und der exacten Wissenschaften (R. Friedländer & Sohn, 1894)

Naturae novitates : Bibliographie neuer Erscheinungen aller Länder auf dem Gebiete der Naturgeschichte und der exacten Wissenschaften (R. Friedländer & Sohn, 1896)

Naturae novitates : Bibliographie neuer Erscheinungen aller Länder auf dem Gebiete der Naturgeschichte und der exacten Wissenschaften (R. Friedländer & Sohn, 1898)

Natural history - Wood, J. G. (John George), 1827 -1889 (G. Routledge, 1896)

Natural history - Wood, J. G. (John George), 1827 -1889 (G. Routledge, 1891)

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)

A natural history of the animal kingdom being a systematic and popular description of the habits, structure, and classification of animals, from the lowest to the highest forms. Arranged according to their organisation - Gray, John Edward 1800 -1875 (Charles Griffin and company, 1860)

The natural history review - Belfast Natural History; Philosophical Society. (Hodges & Smith, 1861)

The natural history review - Belfast Natural History; Philosophical Society. (Hodges & Smith, 1865)

Natural science (Macmillan & Co, 1892)

Natural science (Macmillan & Co, 1896)

Natural selection and tropical nature - Wallace, Alfred Russel, 1823 -1913 (Macmillan and co, 1891)

The naturalist's assistant; a hand-book for the collector and student, with bibliography of fifteen hundred works necessary for the systematic zoölogist - Kingsley, J. S. (John Sterling), 1854 -1929 (S. E. Cassino, 1882)

Naturen : illustreret maanedsskrift for populaer naturvidenskab - Bergens Museum. (E. B. Giertsen [etc.], 1918)

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.], 1907)

Naturwissenschaftliche Wochenschrift - Deutsche Gesellschaft für Volkstümliche Naturkunde in Berlin. (G. Fischer [etc.], 1908)

Naturwissenschaftlicher Beobachter (Zoologische Gesellschaft [etc.], 1898)

Nederlandsch kruidkundig archief - Koninklijke Nederlandse Botanische Vereniging. (S. en J. Luchtmans, 1903)

Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde - Bronn, H. G. (Heinrich Georg), 1800 -1862 (E. Schweizerbart's Verlagshandlung, 1891)

New coral snakes from Peru - Schmidt, Karl Patterson, 1890 -1957 (1925)

A new genus and new tribe for Enicognathus melanauchen Jan, 1863, a neglected South American snake (Colubridae, Xenodontinae), with taxonomic notes on some Dipsadinae - Myers, Charles W. (American Museum of Natural History, 2011)

A new genus and species of colubrid snake from the Mexican state of Oaxaca - Bogert, Charles M. (Charles Mitchill), 1908 -1992 (American Museum of Natural History, 1963)

A new genus and species of colubrid snake from the Sierra Madre del Sur of Guerrero, Mexico - Campbell, Jonathan A. (American Museum of Natural History, 1981)

A new genus and species of dwarf boa from southern Mexico - Bogert, Charles M. (Charles Mitchill), 1908 -1992 (American Museum of Natural History, 1968)

A new genus for Andean snakes related to Lygophis boursieri and a new species (Colubridae) - Myers, Charles W. (American Museum of Natural History, 1973)

A new genus for South American snakes related to Rhadinaea obtusa Cope (Colubridae) and resurrection of Taeniophallus Cope for the "Rhadinaea" brevirostris group - Cadle, John E. (American Museum of Natural History, 1994)

A new genus of colubrid snake from the Upper Miocene of North America - Auffenberg, Walter, 1928 -2004 (American Museum of Natural History, 1958)

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)

The New Mexico botanist - New Mexico State University. Cooperative Extension Service. (Range Science Herbarium and Cooperative Extension Service, 2015)

A new species of Geophis (Serpentes, Colubridae) from the State of Colima, Mexico - Gertsch, Willis John, 1906 - (American Museum of Natural History, 1966)

New species of lizards from Auyantepui and La Escalera in the Venezuelan Guayana, with notes on "microteiid" hemipenes (Squamata, Gymnophthalmidae) - Myers, Charles W. (American Museum of Natural History, 2009)

A new species of Riama from Ecuador previously referred to as Riama hyposticta (Boulenger, 1902) (Squamata, Gymnophthalmidae) - Nunes, Pedro Murilo Sales (American Museum of Natural History, 2011)

A new species of the colubrid genus Mehelya from Nigeria - Dunger, Gerald T. (American Museum of Natural History, 1966)

New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters - Myers, Charles W. (American Museum of Natural History, 2014)

Newsletter - Harvard University. Museum of Comparative Zoology. (The Museum, 1964)

Noções geraes sobre cobras - Kraus, Rodolpho (Comp. Melhoramentos de São Paulo, 1923)

Nomenclator zoologicus : continens nomina systematica generum animalium tam viventium quam fossilium, secundum ordinem alphabeticum disposita, adjectis auctoribus, libris, in quibus reperiuntur, anno editionis, etymologia et familiis, ad quas pertinent, in singulis classibus - Agassiz, Louis, 1807 -1873 (Jent et Gassmann, 1842)

Nomenclator zoologicus continens nomina systematica generum animalium tam viventium quam fossilium, secundum ordinem alphabeticum disposita, sub auspiciis et sumptibus C. R. Societatis zoologico-botanicae conscriptus a comite Augusto de Marschall - Marschall, August Friedrich, 1804 -1887 (typis C. Ueberreuter (M. Salzer), 1873)

Nomenclatoris zoologici index universalis : continens nomina systematica classium, ordinum, familiarum et generum animalium omnium ... homonymiis plantarum - Agassiz, Louis, 1807 -1873 (Sumptibus Jent et Gassman, 1848)

Nomina systematica generum reptilium, tam viventium quam fossilium : secundum ordinem alphabeticum disposita, adjectis auctoribus, libris in quibus reperiuntur, anno editionis, etymologia et familiis ad quas pertinent - Agassiz, Louis, 1807 -1873 (s.n, 1844)