Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1853)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1863)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1870)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1879)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1880)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1882)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1900)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1902)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1904)

The oak : a popular introduction to forest-botany - Ward, H. Marshall (Harry Marshall), 1854 -1906 (D. Appleton, 1892)

The oak : a popular introduction to forest-botany - Ward, H. Marshall (Harry Marshall), 1854 -1906 (K. Paul Trech Trübner, 1892)

The oak : a popular introduction to forest botany - Ward, H. Marshall (Harry Marshall), 1854 -1906 (D. Appleton and Co, 1892)

The oak; a popular introduction to forest-botany - Ward, H. Marshall (Harry Marshall), 1854 -1906 (K. Paul, Trench, Trübner, & co., ltd, 1892)

The oak: a popular introduction to forest-botany - Ward, H. Marshall (Harry Marshall), 1854 -1906 (D. Appleton and company, 1892)

[Observations sur les lépidoptères] - Bellier de La Chavignerie, Eugène, 1819 -1888 (s.n, 1880)

Occasional paper - Entomological Society of British Columbia (The Society, 2015)

Occasional Papers of the Bernice Pauahi Bishop Museum of Polynesian Ethnology and Natural History - Bernice Pauahi Bishop Museum. (Bishop Museum Press, 1914)

Occasional papers of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1869)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1897)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1922)

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, 2013)

Occasional papers of the Museum of Zoology, University of Michigan - University of Michigan. Museum of Zoology. (University of Michigan, 1917)

Odontography : or a treatise on the comparative anatomy of the teeth, their physiological relations, mode of development and microscopic structure, in the vertebrate animals - Owen, Richard, 1804 -1892 (Hippolyte Bailliere, 1840)

Odontography; or, A treatise on the comparative anatomy of the teeth; their physiological relations, mode of development, and microscopic structure, in the vertebrate animals - Owen, Richard, 1804 -1892 (H. Baillière, 1840)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1863)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1872)

Oeuvres du comte de Lacépède : comprenant l'histoire naturelle des quadrupèdes ovipares, des serpents, des poissons et des cétacés; accompanées du portrait de l'auteur et d'environ 400 figures, exécutés pour cette édition par les meilleurs artistes - Cuvier, Georges, baron, 1769 -1832 (Chez F.D. Pillot, 1832)

Official lists and indexes of names and works in zoology - International Commission on Zoological Nomenclature (ICZN, 1987)

Official lists and indexes of names and works in zoology. Supplement 1986-2000 - International Commission on Zoological Nomenclature (International Trust for Zoological Nomenclature, c/o Natural History Museum, 2001)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1844)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1862)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1868)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1871)

Les oiseaux de la Suisse (Catalogue des oiseaux de la Suisse de V. Fatio et Th. Studer) élaboré par ordre du Département fédéral de l'intérieur (Inspection des forêts, chasse et pêche) - Fatio, Victor, 1838 -1906 (1908)

Okens Lehrbuch der Naturgeschichte - Oken, Lorenz, 1779 -1851 (Bei Carl Heinrich Reclam, 1815)

Okens Lehrbuch der Naturgeschichte - Oken, Lorenz, 1779 -1851 (Bei Carl Heinrich Reclam, 1816)

On a collection of butterflies - Butler, Arthur G. (Arthur Gardiner), 1844 -1925 (1880)

On the anatomy of vertebrates - Owen, Richard, 1804 -1892 (Longmans, Green, 1866)

On the anatomy of vertebrates ... - Owen, Richard, 1804 -1892 (Longmans, Green and Co, 1866)

On the batrachia and reptilia of Costa Rica : With notes on the herpetology and ichthyology of Nicaragua and Peru - Cope, E. D. (Edward Drinker), 1840 -1897 (s.n, 1875)

On the batrachia and reptilia of Costa Rica : With notes on the herpetology and ichthyology of Nicaragua and Peru / by E. D. Cope - Cope, E. D. (Edward Drinker), 1840 -1897 (s.n, 1875)

On the fauna and flora of the west of Scotland. Meeting at Glasgow, September, 1876 - British Association for the Advancement of Science. (Blackie, 1876)

On the habits and instincts of animals - Swainson, William, 1789 -1855 (Printed for Longman, Orme, Brown, Green, & Longmans, 1840)

On the micro-lepidoptera of the West Indies - Walsingham, Thomas de Grey,‏ ‎ Lord, 1843 -1919 (Zoological Society of London, 1891)

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 systematic position of Tortrix nigrivelata (Lepidoptera, Tortricidae) - Obraztsov, Nikolaus S., 1906 - (American Museum of Natural History, 1959)

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, 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, 1957)

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)

Opuscula entomologica - Thomson, C. G. (Carl Gustav), 1824 -1899 (1889)

Opuscula entomologica - Thomson, C. G. (Carl Gustav), 1824 -1899 (1891)

Opuscula entomologica - Thomson, C. G. (Carl Gustav), 1824 -1899 (1892)

Opuscula Ichneumonologica : Fascicule 1-45 - Schmiedeknecht, Otto, 1847 -1936 ([s.n.], 1902)

Opuscula Ichneumonologica : Fascicule 1-45 - Schmiedeknecht, Otto, 1847 -1936 ([s.n.], 1906)

Orchard and farm (Calkins Newspaper Syndicate, 1922)

The orchard and fruit garden: their culture and produce - Watts, Elizabeth. (F. Warne & Co, 1867)

Order Lepidoptera (Micro-lepidoptera) Sub-Div. (IV) Lepidoptera Vespertina. Family I, Tortricidae - Stephens, James Francis, 1792 -1853 (British Museum?, 1852)