Number 1 of Annulosa javanica, or, An attempt to illustrate the natural affinities and analogies of the insects collected in Java by Thomas Horsfield ... : and deposited by him in the museum of the Honourable East-India Company [no. 1] - Horsfield, Thomas, 1773 -1859 (Kingsbury, Parbury, and Allen, 1825)

Nuovi annali delle scienze naturali (1838)

Nuovi annali delle scienze naturali (1847)

Nuovo Giornale d'Italia Spettante alla Scienza Naturali (1780)

Nye bidrag til kundskaben om Middelhavets invertebratfauna. IV, Ostracoda mediterranea (sydeuropæiske Ostracoder) - Sars, G. O. (Georg Ossian), 1837 -1927 (Alb. Cammermeyer, 1887)

Nye Samling af det Kongelige Danske Videnskabers Selskabs Skrifter - Kongelige Danske videnskabernes selskab. (1781)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1851)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1864)

Nyt magazin for naturvidenskaberne - Physiographiske forening i Christiania. (Johan Dahl, 1911)

Obseruationes circa viuentia, quæ in rebus non viuentibus reperiuntur : Cum micrographia curiosa siue Rerum minutissimarum obseruationibus, quæ ope microscopij recognitæ ad viuum exprimuntur : his accesserunt aliquot animalium testaceorum icones non antea in lucem editæ : omnia curiosorum naturæ exploratorum vtilitati & iucunditati expressa & oblata - Buonanni, Filippo, 1638 -1725 (Typis Dominici Antonij Herculis, 1691)

Observationes et historiae omnes & singulae è Guijielmi Harvei libello De generatione animalium excerptae, & in accuratissimum ordinem redactae : item Wilhelmi Langly De generatione animalium observationes quaedam : accedunt Ovi faecundi singulis ab incubatione diebus factae inspectiones : ut et Observationum anatomico-med. decades quatuor, denique Cadavara balsamo condiendi modus - Harvey, William, 1578 -1657 (Typis Abrahami Wolfgang, 1674)

Observationes in historiam naturalem et anatomiam comparatam in itinere Groenlandico factae ... / auctor Martinus Guilelmus Mandt - Mandt, Martin Wilhelm, 1800 -1858 (Formis Brueschckianis, 1822)

Observationes zoologicas de zoophytis coralliis, speciatim de genere Fungia : et descriptionem nonnullarum hujus generis specierum novarum vel nondum accuratius cognitarum / edidit Frid. Sigism. Leuckart ; cum tabulis IV aere incisis - Leuckart, F. S. (Friedrich Sigismund), 1794 -1843 (1841)

Observationum medicarum Castrensium Hungaricarum decades tres. In usum publicum hoc tempore recusae - Meibom, Heinrich, 1638 -1700 (F. Lüderwaldi, 1685)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1963)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2009)

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, 2012)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2013)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1973)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1974)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1992)

Occasional papers of the Museum of Natural History, the University of Kansas - University of Kansas. Museum of Natural History. (The University, 1993)

Occasional papers on mollusks - Harvard University. Museum of Comparative Zoology. Department of Mollusks. (Dept. of Mollusks, 1958)

Occasional papers on mollusks - Harvard University. Museum of Comparative Zoology. Department of Mollusks. (Dept. of Mollusks, 1971)

Occasional papers on mollusks - Harvard University. Museum of Comparative Zoology. Department of Mollusks. (Dept. of Mollusks, 1992)

Occasional papers on mollusks - Harvard University. Museum of Comparative Zoology. Department of Mollusks. (Dept. of Mollusks, 1999)

Oceanus - Woods Hole Oceanographic Institution. (Woods Hole Oceanographic Institution, 1983)

Oceanus - Woods Hole Oceanographic Institution. (Woods Hole Oceanographic Institution, 1990)

Oceanus - Woods Hole Oceanographic Institution. (Woods Hole Oceanographic Institution, 1991)

Oesterreichisches botanisches Wochenblatt ([L.W. Seidel], 1853)

Œuvres complètes de Buffon avec la nomenclature Linnéenne et la classification de Cuvier - Buffon, Georges Louis Leclerc, comte de, 1707 -1788 (1853)

Oeuvres complètes de Christiaan Huygens. Publiées par la Société hollandaise des sciences - Huygens, Christiaan, 1629 -1695 (M. Nijhoff, 1888)

Of microscopes and the discoveries made thereby : illustrated with many copper-plates - Baker, Henry, 1698 -1774 (Printed for J. Dodsley, 1785)

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)

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

Öfversigt af Finska vetenskaps-societetens förhandlingar - Suomen Tiedeseura (s.n.], 1838)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1857)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1864)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1878)

Öfversigt af Kongl. Vetenskaps-akademiens forhandlingar - Kungl. Svenska vetenskapsakademien. (P. A. Norstedt & Söner, 1884)

Ohio fossils - La Rocque, Aurèle, 1909 -1990 (Ohio Dept. of Natural Resources, Division of Geological Survey, 1955)

Les Oiseaux d'Europe décrits par C. J. Temminck - Werner, Johann Carl. (1848)

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

Om slägtet Sorex, med några nya arters beskrifning - Sundevall, Carl J., 1801 -1875 (Kungliga Vetenskapsakademien, 1842)

Om Sveriges hydrachnider - Neuman, Carl Julius, 1839 -1912 (Kongl. boktryckeriet, P.A. Norstedt & söner, 1880)

Om tillvaron af ett centrum i naturliga grupper såväl inom djur-som växt-verlden - Lindblad, Matts Adolf, 1821 -1899 (Berklingska Boktr, 1857)

Omnium stirpium sciagraphia et icones : quibus plantarum et radicum tum in hortis cultarum, tum in vrbium fossis & muris, pratis, aruis, montibus, collibus, nemoralibus, fluviis, riguis & littoralibus, villis & pagis, spontè provenientium, nomina, figura, natura, natales, synonyma, vsus & virtutes, docentur : cum doctissimorum scriptorum circa eas consensu & dissensu - Chabrey, Dominique, 1610 -1669 (Sumptibus Samuelis de Tournes, 1678)

On a new genus of the Crustacea, and the species on which it is established. Read July 8, 1817 - Say, Thomas, 1787 -1834 (Academy of Natural Sciences of Philadelphia, 1817)

On animal and vegetable parasites of the human body a manual of their natural history, diagnosis, and treatment - Lankester, Edwin, 1814 -1874 (Printed for the Sydenham Society, 1857)

On animal and vegetable parasites of the human body, a manual of their natural history, diagnosis, and treatment - Küchenmeister, Friedrich, 1821 -1890 (Printed for the Sydenham Society, 1857)

On animal and vegetable parasites of the human body, a manual of their natural history, diagnosis, and treatment - Küchenmeister, Friedrich, 1821 -1890 (Printed for the Sydenham society, 1857)

On growth and form - Thompson, D'Arcy Wentworth, 1860 -1948 (University press, 1917)

On growth and form - Thompson, D'Arcy Wentworth, 1860 -1948 (University Press, 1945)

On some remarkable forms of animal life from the great deeps off the Norwegian coast... - Sars, G. O. (Georg Ossian), 1837 -1927 (Printed by Brøgger & Christie [etc.], 1872)

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 entomology and uses of silk : with a list of the families, genera, and species of silk producers known up to the present date - Wardle, Thomas, Sir, 1831 -1909 (G. T. Bagguley, Printer, 1880)

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 relationships of the spider genus Cybaeodes (Araneae, Dionycha) - Platnick, Norman I. (American Museum of Natural History, 1992)

On the Silurian Gastropoda and Pteropoda of Gotland - Lindström, Gustaf, 1829 -1901 (P.A. Norstedt, 1884)

On the vegetation of the Carboniferous period, as compared with that of the present day - Hooker, Joseph Dalton, 1817 -1911

On two orders of Arachnida : Opiliones, especially the suborder Cyphophthalmi, and Ricinulei, namely the family Cryptostemmatoidae - Royal Society (Great Britain) (University Press, 1904)