Researches upon the venom of the rattlesnake : with an investigation of the anatomy and physiology of the organs concerned - Mitchell, S. Weir (Silas Weir), 1829 -1914 (Smithsonian Institution, 1860)

Researches upon the venoms of poisonous serpents - Reichert, Edward Tyson, 1855 - (Published by the Smithsonian Institution, 1886)

Results of a biological survey of the San Francisco Mountain region and desert of the Little Colorado, Arizona - Stejneger, Leonhard, 1851 -1943 (Govt. Print. Off, 1890)

Rettili, pesci e animali articolati - Figuier, Louis, 1819 -1894 (Fratelli Treves, 1881)

Return / British Museum - British Museum (Natural History) (British Museum, 1896)

A review of the primates - Elliot, Daniel Giraud, 1835 -1915 (American Museum of Natural History, 1913)

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Révision de la famille des ixodidés - Neumann, G (1896)

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Revista do Museu Paulista - Museu Paulista (O Museu, 1927)

Revista do Museu Paulista - Museu Paulista (O Museu, 1931)

Revista do Museu Paulista - Museu Paulista (Museu Paulista, 1907)

Revista do Museu Paulista - Museu Paulista (Museu Paulista, 1911)

Revista do Museu Paulista - Museu Paulista (O Museu, 1937)

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Revue générale des écrits de Linné; ouvrage dans lequel on trouve les anecdotes les plus intéressantes de sa vie privée, un abrégé de ses systêmes et de ses ouvrages, un extrait des ses Aménités académiques ... - Pulteney, Richard, 1730 -1801 (Buisson, 1789)

Revue générale des sciences pures et appliquées ([s.n.], 1904)

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Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1986)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1990)

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Richard Owen commemoration : three studies - Natural History Museum (London, England) (Natural History Museum Publications, 1992)

Richard Schomburgk's travels in British Guiana, 1840-1844 - Schomburgk, Richard, 1811 -1891 ("Daily Chronicle" Office, 1922)

Ritualistic combat of male gopher snakes, Pituophis melanoleucus affinis (Reptilia, Colubridae) - Bogert, Charles M. (Charles Mitchill), 1908 -1992 (American Museum of Natural History, 1966)

The Riverside natural history - Kingsley, J. S. (John Sterling), 1854 -1929 (Houghton, Mifflin and Company, 1888)

Roosevelt wild life bulletin ... of the Roosevelt Life Forest Experiment Station of the New York College of Forestry at Syracuse University - New York State College of Forestry at Syracuse University. Roosevelt Wild Life Forest Experiment Station. (The University, 1930)

The royal natural history - Lydekker, Richard, 1849 -1915 (Frederick Warne & Co, 1896)

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The royal natural history - Lydekker, Richard, 1849 -1915 (F. Warne, 1896)

The royal natural history - Lydekker, Richard, 1849 -1915 (F. Warne, 1893)

The rural cyclopedia, or, A general dictionary of agriculture and of the arts, sciences, instruments, and practice, necessary to the farmer, stockfarmer, gardener, forester, landsteward, farrier, &c - Wilson, John M. (John Marius) (A. Fullarton, 1849)

Rural New Yorker - Moore, D. D. T. (Rural Pub. Co. [etc.], 1890)

Saggio di una distribuzione metodica degli animali vertebrati - Bonaparte, Charles-Lucien, 1803 -1857 (1831)

The savage world : a complete natural history of the world's creatures, fishes, reptiles, insects, birds and mammals : founded upon the theory of the progression of species, and in accordance with genetic revelation, scriptural truths, and the harmony of nature ... - Buel, James W. (James William), 1849 -1920 (Published and manufactured by Historical Publishing Company, 1891)

Schlangen und Schlangenfeinde - Lenz, Harald Othmar, 1799 -1870 (E.F. Thienemann, 1870)

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The serpents of Pennsylvania - Surface, H. A. (Harvey Adam), 1867 -1941 (Harrisburg Publishing Co, 1906)

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Serpentum Brasiliensium species novae = ou, Histoire naturelle des espèces nouvelles de serpens : recueillies et observées pendant le voyage dans l'intérieur du Brésil dans les années 1817, 1818, 1819, 1820 - Spix, Johann Baptist von, 1781 -1826 (Typis F.S. H©bschmanni, 1824)