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, 1959)

Oppian, Colluthus, Tryphiodorus, with an English translation by A.W. Mair - Colluthus, of Lycopolis. (W. Heinemann, 1928)

Optical activity and living matter - Gauze, G. F. (Georgiĭ Frant︠s︡evich) 1910 -1986 (Biodynamica, 1941)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1916)

Ostasiastische Dekapoden - Doflein, Franz, 1873 -1924 (Verlag der k. Akademie in Commission des G. Franz'schen Verlags (J. Roth), 1902)

Ostasiastische Dekapoden - Doflein, Franz, 1873 -1924 (Verlag der k. Akademie in Commission des G. Franz'schen Verlags (J. Roth), 1914)

Ostasiatische decapoden - Balss, Heinrich, 1886 -1957 (1914)

Die österreichische Polarstation Jan Mayen, ausgerüstet durch Graf Hanns Wilczek, geleitet vom Emil Edlen von Wohlgemuth. Beobachtungs-Ergebnisse, hrsg. von der Kaiserlichen Akademie der Wissenschaften - International Polar Expedition 1882 -1883 (In Commission bei K. Gerold's Sohn, 1886)

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

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

Outlines of zoology - Thomson, J. Arthur (John Arthur), 1861 -1933 (D. Appleton, 1906)

Oversigt over det Kongelige Danske videnskabernes selskabs forhandlinger = Bulletin de l'Académie royale des sciences et des lettres de Danemark - Kongelige Danske videnskabernes selskab. (A.F. Høst, 1878)

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

Palaemons of the Philippine Islands - Cowles, R. P. (Rheinart Parker), 1872 -1948 (Bureau of Printing, 1914)

Palaeontographica (Theodor Fischer, 1861)

Palaeontographica (Theodor Fischer, 1863)

Palaeontographica (Theodor Fischer, 1864)

Palaeontographica (Theodor Fischer, 1866)

Palaeontographica (Theodor Fischer, 1867)

Palaeontographica (Theodor Fischer, 1907)

Palaeontographica (Theodor Fischer, 1914)

Palaeontologische Mittheilungen aus dem Museum des Koeniglich-Bayerischen Staates / von Albert Oppel - Zittel, Karl Alfred von, 1839 -1904 (Ebner & Seubert [et al.], 1862)

Palaeontology - Palaeontological Association (Palaeontological Association, 1995)

Palaozoologie : Entwurf einer systematischen Darstellung der Fauna der Vorwelt - Giebel, C. (Christoph), 1820 -1881 (Nulandt'sche buchandlung (L. Garcke), 1846)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1957)

Le parasitisme et la symbiose - Caullery, Maurice, 1868 -1958 (Doin, 1922)

Pelagos, saggi sulla vita e sui prodotti del mare - Giglioli, Enrico Hillyer, 1845 -1909 (Tipografia del R. Istituto de' Sordo-Muti, 1884)

Pflügers Archiv für die gesamte Physiologie des Menschen und der Tiere (M. Hager, 1911)

Pflügers Archiv für die gesamte Physiologie des Menschen und der Tiere (M. Hager, 1920)

Pflügers Archiv für die gesamte Physiologie des Menschen und der Tiere (M. Hager, 1921)

The Philippine journal of science - Philippines. National Science Development Board. (Bureau of Science, 1914)

The Philosophical transactions of the Royal society of London, from their commencement in 1665, in the year 1800 - Royal Society (Great Britain) (Printed by and for C. and R. Baldwin, 1809)

Phylogeny and evolution of Crustacea : proceedings of a conference held at Cambridge, Mass, March 6-8, 1962 - Whittington, H. B. (Harry Blackmore), 1916 -2010 (Museum of Comparative Zoology, 1963)

Die Physiologie der facettirten Augen von Krebsen und Insecten : eine Studie - Exner, Siegmund, 1846 -1926 (Franz Deuticke, 1891)

Planktonkunde - Steuer, Adolf, 1871 - (B.G. Teubner, 1910)

Poirieria - Auckland Institute; Museum. Conchology Section. (Auckland Museum, Conchology Section, 1975)

Poirieria - Auckland Institute; Museum. Conchology Section. (Auckland Museum, Conchology Section, 2002)

Pomarium Britannicum: an historical and botanical account of fruits, known in Great Britain - Phillips, Henry, 1775 -1838 (Printed for the author, and sold by T. and J. Allman, 1820)

Pomarium Britannicum : an historical and botanical account of fruits known in Great Britain - Phillips, Henry, 1775 -1838 (Printed for T. and J. Allman, 1821)

A popular history of British Crustacea; comprising a familiar account of their classification and habits - White, Adam, 1817 -1879 (L. Reeve, 1857)

Popular natural history : a description of animal life, from the lowest forms up to man - Kingsley, J. S. (John Sterling), 1854 -1929 (Estes & Lauriat, 1890)

Popular Science Review (1873)

Die preussische expedition nach Ost-Asien : nach amtlichen quellen. V. 1, Zoologischer theil - Martens, Eduard von, 1831 -1904 (R. v. Decker, 1876)

Primae lineae systematis naturæ : nexui naturali omnium evolutionique progressivae per nixus reascendentes superstructi - Gori͡aninov, Pavel Fedorovich, 1796 -1865 (Typis Karoli Krajanis, 1834)

Problems of relative growth - Huxley, Julian, 1887 -1975 (L. MacVeagh, The Dial Press, 1932)

Proceedings - Essex Institute. (1856)

Proceedings and transactions of the British Entomological and Natural History Society - British Entomological; Natural History Society. (British Entomological and Natural History Society, 1980)

Proceedings and transactions of the Liverpool Biological Society - Liverpool Biological Society. (The Society, 1903)

Proceedings and transactions of the Natural History Society of Glasgow - Natural History Society of Glasgow. (The Society, 1883)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1848)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1850)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1852)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1857)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1860)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1891)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1893)