On the poison of venomous snakes and the methods of preventing death from their bite. Reprinted papers by Sir Joseph Fayrer, Sir Lauder Brunton and Major Leonard Rogers - Fayrer, Joseph, Sir, 1824 -1907 (Macmillan, 1909)

On the poison of venomous snakes and the methods of preventing death from their bite - Fayrer, Joseph, Sir, 1824 -1907 (Macmillan and Co., limited, 1909)

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

On the reptiles and Batrachians of North America - Garman, Samuel, 1843 -1927 (Major, Johnston & Barrett, Yeoman, 1883)

On the serpents of New York; with a notice of a species not hitherto included in the fauna of the state - Baird, Spencer Fullerton, 1823 -1887 (C. Van Benthuysen, printer, 1854)

On the venomous serpents of Georgia. Part 1, Natural history and physiology - LeConte, John L. (John Lawrence), 1825 -1883 (J. McCafferty, 1853)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank H. Lattin, 1889)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank H. Lattin, 1890)

Ophidia taprobanica; or, The snakes of Ceylon - Wall, Frank, 1868 -1950 (H.R. Cottle, govt. printer, 1921)

Ophidians, zoological arrangement of the different genera, including varieties known in North and South America, the East Indies, South Africa, and Australia. Their poisons, and all that is known of their nature. Their galls, as antidotes to the snake-venom - Higgins, S. B. (Boericke & Tafel, 1873)

Opinions and declarations rendered by the International Commission on Zoological Nomenclature - International Commission on Zoological Nomenclature (Printed by order of the International Trust for Zoological Nomenclature, 1958)

Opinions and declarations rendered by the International Commission on Zoological Nomenclature - International Commission on Zoological Nomenclature (Printed by order of the International Trust for Zoological Nomenclature, 1955)

Opinions and declarations rendered by the International Commission on Zoological Nomenclature - International Commission on Zoological Nomenclature (Printed by order of the International Trust for Zoological Nomenclature, 1956)

Opuscoli scientifici d'entomologia, di fisica e d'agricoltura - Termeyer, Ramón María, 1737 -1814 (Nella Stamperia del Giornale italico di Carlo Dova, contrada S. Rafaello, num. 998, 1807)

Die ordnungen, familien und gattungen der reptilien als prodrom einer naturgeschichte derselben - Oppel, Michael, 1782 -1820 (In commission bey J. Lindauer, 1811)

Organization of repetitive DNA in the primitive reptile (Sphenodon Punctatus) - Van Den Bussche, Ronald A. (Museum of Texas Tech University, 1998)

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)