The origin and influence of the thoroughbred horse - Ridgeway, William, Sir, 1853 -1926 (University Press, 1905)

The origin and relationship of the large mammals of North America - Grant, Madison. (Reprinted from the eighth annual report of the New York Zoological Society, 1904)

The origin and relationship of the large mammals of North America - New York Zoological Society. (1904)

The origin of the fittest : essays on evolution - Cope, E. D. (Edward Drinker), 1840 -1897 (D. Appleton, 1887)

The origin of the fittest : essays on evolution - Cope, E. D. (Edward Drinker), 1840 -1897 (Macmillan and Company, 1887)

The origin of the fittest; essays on evolution - Cope, E. D. (Edward Drinker), 1840 -1897 (D. Appleton, 1887)

L'origine et le développement des flores dans le massif central de France; avec aperçu sur les migrations des flores dans l'Europe sud-occidentale - Braun-Blanquet, J. (Josias), 1884 -1980 (L. Lhomme, 1923)

Les origines animales de l'homme; éclairées par la physiologie et l'anantome comparatives - Durand, Joseph Pierre, 1826 -1900 (G. Baillière, 1871)

Ortus sanitatis - Prüss, Johann, 1446 or 1447 -1510 (Johann Prüss)

Ostéographie, ou, Description iconographique comparée du squelette et du système dentaire des Mammifères récents et fossiles : pour servir de base à la zoologie et à la géologie - Blainville, H.-M. Ducrotay de (Henri-Marie Ducrotay), 1777 -1850 (J.B. Baillière et fils, 1839)

Osteological assessment of Pleistocene Camelops hesternus (Camelidae, Camelinae, Camelini) from Alaska and Yukon - MacPhee, R. D. E. (American Museum of Natural History, 2016)

Osteology of birds - Shufeldt, Robert Wilson 1850 -1934 (University of the State of New York, 1909)

The osteology of the Steganopodes - Shufeldt, Robert Wilson 1850 -1934 (Carnegie Institute, 1902)

Osteology of the waterfowl - Woolfenden, Glen Everett, 1930 - (1960)

Othniel Charles Marsh - Beecher, Charles Emerson, 1856 -1904 (1899)

Othniel Charles Marsh - Beecher, Charles Emerson, 1856 -1904 (s.n, 1899)

Our living resources : a report to the nation on the distribution, abundance, and health of U.S. plants, animals, and ecosystems - United States. National Biological Service. (U.S. Dept. of the Interior, National Biological Service, 1995)

Our living world; an artistic edition of the Rev. J. G. Wood's Natural history of animate creation - Wood, J. G. (John George), 1827 -1889 (S. Hess, 1885)

Ouresiphoitēs Helveticus, sive, Itinera per Helvetiae Alpinas regiones facta annis MDCCII, MDCCIII, MDCCIV, MDCCV, MDCCVI, MDCCVII, MDCCIX, MDCCX, MDCCXI : plurimis tabulis aeneis illustrata - Scheuchzer, Johann Jakob, 1672 -1733 (Typis ac sumptibus Petri Vander Aa, 1723)

An outline of the theory of organic evolution, with a description of some of the phenomena which it explains - Metcalf, Maynard M. (Maynard Mayo), 1868 -1940 (The Macmillian company; [etc., etc.], 1906)

An outline of the theory of organic evolution, with a description of some of the phenomena which it explains - Metcalf, Maynard M. (Maynard Mayo), 1868 -1940 (The Macmillian company; [etc., etc.], 1904)

An outline of the theory of organic evolution with a description of some of the phenomena which it explains - Metcalf, Maynard M. (Maynard Mayo), 1868 -1940 (MacMillan, 1906)

Outlines of comparative anatomy and medical zoology - Allen, Harrison, 1841 -1897 (Lippincott, 1874)

Outlines of comparative anatomy and medical zoology - Allen, Harrison, 1841 -1897 (J.B. Lippincott & co, 1869)

Outlines of comparative anatomy : intended principally for the use of students - Fyfe, Andrew, 1754 -1824 (Printed by J. Pillans & sons for Adam Black, South Bridge Street, 1813)

Outlines of comparative anatomy intended principally for the use of students - Fyfe, Andrew, 1754 -1824 (Printed by J. Pillans & Sons for Adam Black ... [etc.], 1818)

Outlines of cosmic philosophy : based on the doctrine of evolution, with criticisms on the positive philosophy - Fiske, John, 1842 -1901 (Houghton, Mifflin, 1898)

Outlines of cosmic philosophy : based on the doctrine of evolution ; with criticisms on the positive philosophy - Fiske, John, 1842 -1901 (Houghton, Mifflin, 1887)

Outlines of cosmic philosophy : based on the doctrine of evolution, with criticisms on the positive philosophy - Fiske, John, 1842 -1901 (Houghton, Mifflin, 1903)

Outlines of evolutionary biology - Dendy, Arthur, 1865 -1925 (Constable, 1912)

Outlines of evolutionary biology - Dendy, Arthur, 1865 -1925 (D. Appleton and company, 1912)

Outlines of evolutionary biology - Dendy, Arthur, 1865 -1925 (D. Appleton and company, 1914)

Outlines of general zoology - Baird, Spencer Fullerton, 1823 -1887 (Rudolph Garrigue, 1851)