On the history and natural arrangement of insects - Shuckard, William Edward, 1802 -1868 (Printed for Longman, Orme, Brown, Green, & Longmans [etc.], 1840)

On the impregnation of the ovum in the Amphibia ... (First series ... second series, rev.) And on the direct agency of the spermatozoon - Newport, George 1803 -1854 (1851)

On Turritopsis nutricula (McCrady) - Brooks, William Keith, 1848 -1908 (1907)

One hundred lessons in elementary agriculture : a manual and text of elementary agriculture for rural schools - Nolan, Aretas W. (Aretas Wilbur), 1874 -1959 (Acme Pub. Co, 1908)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank Haak), 1861 -1937 (Frank H. Lattin, 1889)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank Haak), 1861 -1937 (Frank H. Lattin, 1895)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank Haak), 1861 -1937 (Frank H. Lattin, 1898)

The Oölogist for the student of birds, their nests and eggs - Lattin, Frank H. (Frank Haak), 1861 -1937 (Frank H. Lattin, 1900)

The open book of nature : an introduction to nature study - Hall, Charles A. (Charles Albert), 1872 -1965 (Adam and Charles Black, 1911)

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)

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, 1954)

Opuscula zoologica - Zoologische Staatssammlung München. (Zoologische Staatssammlung, 1960)

Opuscula zoologica - Zoologische Staatssammlung München. (Zoologische Staatssammlung, 1962)

The orders, sub-orders and genera of insects - Couper, William, 1886 (s.n, 1864)

Organic evolution considered - Fairhurst, Alfred, 1843 -1921 (Christian publishing, 1897)

The origin and evolution of life : on the theory of action, reaction and interaction of energy - Osborn, Henry Fairfield, 1857 -1935 (Scribner's, 1918)

The origin and evolution of life, on the theory of action, reaction and interaction of energy - Osborn, Henry Fairfield, 1857 -1935 (C. Scribner's Sons, 1917)

The origin of man - Headstrom, Richard, 1902 -1985 (Princeton University Press], 1921)

The origin of vertebrates - Gaskell, Walter Holbrook, 1847 -1914 (Longmans, Green, 1908)

The origin of vertebrates - Gaskell, Walter Holbrook, 1847 -1914 (Longmans, Green, and co, 1908)

Ornithological notes - Herrick, C. L. (Clarence Luther), 1858 -1904 (Geological and Natural History Survey of Minnesota, 1877)

[Orr's Circle of the sciences. A series of treatises on the principles of science, with their application to practical pursuits. Organic nature ... - Owen, Richard, 1804 -1892 (W.S. Orr, 1854)

Orthoptera of northeastern America : with especial reference to the faunas of Indiana and Florida - Blatchley, W. S. (Willis Stanley), 1859 -1940 (Nature Pub. Co., 1920, 1920)

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)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1895)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1896)

Our common insects; first steps to entomology - Cox, Rosalinda Alicia (R. Hardwicke, 1869)

Our insect friends and foes - Duncan, F. Martin (Francis Martin), 1873 -1961 (Methuen, 1911)

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)

An outline of the natural history of our shores - Sinel, Joseph. (S. Sonnenschein, 1906)

An outline of the natural history of our shores - Sinel, Joseph. (Swan Sonnenschein & Co, 1906)

Outlines of comparative anatomy - Grant, Robert Edmond, 1793 -1874 (Bailliere, 1841)

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; presenting a sketch of the present state of knowledge, and of the progress of discovery, in that science; and designed to serve as an introduction to animal physiology, and to the principles of classification in zoology - Grant, Robert Edmond, 1793 -1874 (H. Bailliere, 1841)

Outlines of comparative anatomy, presenting a sketch of the present state of knowledge, and of the progress of discovery, in that science; and designed to serve as an introduction to animal physiology, and to the principles of classification in zoology. Containing part first, Organs of relation or of animal life, and part second, Organs of vegetative or organic life - Grant, Robert Edmond, 1793 -1874 (H. Bailliere, 1841)

Outlines of economic zoölogy - Reese, A. M. (Albert Moore), 1872 -1965 (P. Blakiston's Son & Co, 1919)

Outlines of entomology - Murtfeldt, Mary Esther, 1848 -1913 (Tribune Printing Company, State Printers and Binders, 1891)

Outlines of entomology - Murtfeldt, Mary Esther, 1848 -1913 (Tribune printing company, state printers and binders, 1891)

Outlines of general biology ; an introductory laboratory manual - Hargitt, Charles W. (Charles Wesley), 1852 -1927 (Lea & Febiger, 1922)

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

Outlines of natural history for beginners - Nicholson, Henry Alleyne, 1844 -1899 (Blackwood, 1875)

Outlines of physiology : human and comparative - Royal College of Physicians of Edinburgh. (Longmans, Green, 1867)

Outlines of physiology, human and comparative - Marshall, John, 1818 -1891 (Lea, 1868)

Ovum - Thomson, Allen, 1809 -1884 ([s.n.], 1856)

P.A. Latreille scientiarum et artium instituti Gallici ... Genera crustaceorum et insectorum : secundum ordinem naturalem in familias disposita, iconibus exemplisque plurimis explicata - Latreille, P. A. (Pierre André), 1762 -1833 (Apud Amand Knig, Bibliopolam, 1806)

Pacific flying foxes (Mammalia, Chiroptera) : two new species of Pteropus from Samoa, probably extinct - Helgen, Kristofer M. (American Museum of Natural History, 2009)

Pacific science - University of Hawaii. (University Press of Hawaii, 1947)

Pacific science - University of Hawaii. (University Press of Hawaii, 1957)

Pacific science - University of Hawaii. (University Press of Hawaii, 1961)

Palaeontographica (Theodor Fischer, 1865)

Palaeontographica (Theodor Fischer, 1875)

Palaeontographica Americana - Paleontological Research Institution (Ithaca, N.Y.) (Paleontological Research Institution, 1971)

Palaeontographica Americana - Paleontological Research Institution (Ithaca, N.Y.) (Paleontological Research Institution, 1981)

Palaeontographica Americana - Paleontological Research Institution (Ithaca, N.Y.) (Paleontological Research Institution, 1986)

Palaeontology - Palaeontological Association (Palaeontological Association, 1962)

Palaeontology - Palaeontological Association (Palaeontological Association, 1967)

Palaeontology - Palaeontological Association (Palaeontological Association, 1970)

Palaeontology - Palaeontological Association (Palaeontological Association, 1975)

Palaeontology - Palaeontological Association (Palaeontological Association, 1977)

Palaeontology - Palaeontological Association (Palaeontological Association, 1979)