Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1955)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1953)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1959)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1956)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1968)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1970)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1971)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 2007)

Proceedings of the Indiana Academy of Science - Indiana Academy of Science. ([s.n.], 1905)

Proceedings of the Indiana Academy of Science - Indiana Academy of Science. ([s.n.], 1904)

Proceedings of the International Ornithological Congress (Australian Academy of Science [etc.], 1982)

Proceedings of the Linnean Society of New South Wales - Linnean Society of New South Wales. (Linnean Society of New South Wales, 1921)

Proceedings of the Linnean Society of New South Wales - Linnean Society of New South Wales. (Linnean Society of New South Wales, 1924)

Proceedings of the Linnean Society of New South Wales - Linnean Society of New South Wales. (Linnean Society of New South Wales, 1935)

Proceedings of the Linnean Society of New South Wales - Linnean Society of New South Wales. (Linnean Society of New South Wales, 1965)

Proceedings of the Linnean Society of New South Wales - Linnean Society of New South Wales. (Linnean Society of New South Wales, 2004)

Proceedings of the National Academy of Sciences of the United States of America - National Academy of Sciences (U.S.) (National Academy of Sciences [etc.], 1915)

Proceedings of the National Shellfisheries Association - National Shellfisheries Association. (Published for the National Shellfisheries Association by MPG Communications, 1968)

Proceedings of the National Shellfisheries Association - National Shellfisheries Association. (Published for the National Shellfisheries Association by MPG Communications, 1980)

Proceedings of the Natural Science Association of the University of Toronto - University of Toronto. Natural Science Association. ([The Association], 1893)

Proceedings of the Royal Physical Society of Edinburgh - Royal Physical Society of Edinburgh. (The Society, 1892)

Proceedings of the Royal Society of London. Series B, Containing papers of a Biological character - Royal Society (Great Britain) (Printed for the Royal Society and sold by Harrison & Sons, 1920)

Proceedings of the third USA-USSR symposium on the effects of pollutants upon aquatic ecosystems (U.S. Environmental Protection Agency, 1978)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1931)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1962)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1967)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1852)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1911)

The process of evolution - Ehrlich, Paul R. (McGraw-Hill, 1963)

Prodromus faunae mediterraneae, sive Descriptio animalium maris Mediterranei incolarum, quam comparata silva rerum quatenus innotuit, adiectis locis et nominibus vulgaribus eorumque auctoribus - Carus, Julius Victor, 1823 -1903 (E. Schweizerbart, 1885)

Progress of science in the century - Thomson, J. Arthur (John Arthur), 1861 -1933 (W. & R. Chambers, Limited, 1908)

Progress of science in the century - Thomson, J. Arthur (John Arthur), 1861 -1933 (Linscott Pub. Co, 1906)

Progress of science in the century - Thomson, J. Arthur (John Arthur), 1861 -1933 (Linscott, 1903)

Proteins of the mammalian mitochondrial ribosome - Matthews, David Earl, 1948 - (1976)

The Protozoa - Calkins, Gary N. (Gary Nathan), 1869 -1943 (The Macmillan company, 1901)

The Protozoa - Calkins, Gary N. (Gary Nathan), 1869 -1943 (Macmillan, 1901)

The Protozoa, by Gary N. Calkins - Calkins, Gary N. (Gary Nathan), 1869 -1943 (Macmillan, 1901)

Protozoa - Schwager, Conrad. (C.F. Winter, 1883)

Protozoölogy - Calkins, Gary N. (Gary Nathan), 1869 -1943 (Lea & Febiger, 1909)

Publications: studies from the Dept. of Anatomy - Cornell University. Medical College. (1910)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1861)

Quarterly journal of microscopical science (J. and A. Churchill [etc.], 1868)

Raboty Volzhskoĭ biologicheskoĭ stant͡sii = Arbeiten der Biologischen Wolga-Station - Volzhskai͡a biologicheskai͡a stant͡sii͡a (Stant͡sii͡a, 1913)

Raboty Volzhskoĭ biologicheskoĭ stant͡sii = Arbeiten der Biologischen Wolga-Station - Volzhskai͡a biologicheskai͡a stant͡sii͡a (Stant͡sii͡a, 1914)

Recent advances in cytology - Darlington, C. D. (Cyril Dean), 1903 - (P. Blakiston's son & co., inc, 1937)

Records of the Australian Museum - Australian Museum (Printed by order of the Trustees, 2005)

Die Regulierung des Geschlechtsverhaltnisses : bei der Vermehrung der Menschen, Tiere und Pflanzen - Düsing, Karl, 1859 - (Verlag von Gustav Fischer, 1884)

Reise in den äussersten Norden und Osten Sibiriens während der Jahre 1843 und 1844 mit Allerhöchster Genehmigung auf Veranstaltung der Kaiserlichen Akademie der Wissenschaften zu St. Petersburg ausgeführt und in Verbindung mit vielen Gelehrten - Imperatorskai︠a︡ akademīi︠a︡ nauk (Russia) (Buchdr. der K. Akademie der Wissenschaften : Zu haben bei Eggers, 1851)

Rendiconti - Accademia nazionale dei Lincei. Classe di scienze fisiche, matematiche e naturali. (1920)

Rendiconti - Accademia nazionale dei Lincei. Classe di scienze fisiche, matematiche e naturali. (1921)

Rendiconti - Accademia nazionale dei Lincei. Classe di scienze fisiche, matematiche e naturali. (1922)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1878)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1885)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1900)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1914)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1934)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1935)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1936)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1937)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1938)

Report of the commissioner for 1878 : part VI - United States Fish Commission. (Government Printing Ofice, 1880)

Report of the Commissioner for ... - Baird, Spencer Fullerton, 1823 -1887 (G.P.O, 1880)

Report of the Commissioner for ... - Baird, Spencer Fullerton, 1823 -1887 (G.P.O, 1900)

Report of the state zoölogist - Herrick, C. L. (Clarence Luther), 1858 -1904 (1895)

Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873-76 under the command of Captain George S. Nares ... and the late Captain Frank Tourle Thomson, R.N - Thomson, C. Wyville, Sir, (Charles Wyville), 1830 -1882 (Neill, 1888)

Results of the third joint US-USSR Bering & Chukchi Seas expedition (BERPAC) : Summer 1988 - U.S. Fish; Wildlife Service (U.S. Fish and Wildlife Service, 1992)

Revista del Museo de La Plata - Universidad Nacional de La Plata. (Talleres del Museo de La Plata, 1890)

Revue algologique - Muséum national d'histoire naturelle (France) (Museum national d'histoire naturelle, 1960)

Revue biologique du nord de la France (Le Bigot, 1892)

Revue des questions scientifiques - Société scientifique de Bruxelles. (Société scientifique de Bruxelles, 1890)

Revue des questions scientifiques - Société scientifique de Bruxelles. (Société scientifique de Bruxelles, 1904)

Revue des questions scientifiques - Société scientifique de Bruxelles. (Société scientifique de Bruxelles, 1912)

Revue des travaux scientifiques - France. Ministère de l'Instruction publique (Imprimerie nationale, 1882)

Revue générale de botanique (Libraire générale de l'enseignement, 1906)

Revue générale de botanique (Libraire générale de l'enseignement, 1913)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1946)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1951)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1964)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1966)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1969)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1971)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1973)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1978)

Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1980)

Revue zoologique - Société Cuvierienne. (Société cuvierienne, 1839)

Revue zoologique - Société Cuvierienne. (Société cuvierienne, 1840)

Rivista di biologia (Università di Perugia, etc, 1919)

Rivista di biologia (Università di Perugia, etc, 1921)

Rivista di biologia generale (Fratelli Bocca, 1901)

Rivista di scienze biologiche (Fratelli Bocca, 1899)

Rivista di scienze biologiche (Fratelli Bocca, 1900)

Rivista italiana di scienze naturali : periodico mensile premiato alle esposizioni nazionali di Palermo e di Milano ed a quella internazionale di Chicago (Ufficio, 1901)

RNA/DNA ratios in the estimation of growth stages of oceanic zooplankton populations - Baugh, Dale Eric. (Naval Postgraduate School, 1974)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (J. Nisbet, 1886)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (J. Nisbet, 1870)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (J. Nisbet, 1860)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (J. Nisbet, 1866)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (J. Nisbet, 1862)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (J. Nisbet, 1861)

Romance of natural history - Gosse, Philip Henry, 1810 -1888 (New Amsterdam Book Company, 1903)

The romance of natural history - Gosse, Philip Henry, 1810 -1888 (Gould and Lincoln, 1861)

Rovartani lapok : havi folyóirat különös tekintettel a hasznos és kártékony rovarokra - Magyar Entomologiai Társaság. (Magyar Entomologiai Társaság, 1885)

The royal natural history - Lydekker, Richard, 1849 -1915 (Frederick Warne & Co, 1896)

The royal natural history - Lydekker, Richard, 1849 -1915 (Frederick Warne & Co, 1893)

The royal natural history - Lydekker, Richard, 1849 -1915 (F. Warne, 1896)

The royal natural history - Lydekker, Richard, 1849 -1915 (F. Warne, 1893)

Schriften der Königlichen Physikalisch-Ökonomischen Gesellschaft zu Königsberg - Königliche Physikalisch-Ökonomische Gesellschaft zu Königsberg. (In Commission bei Gräfe und Unzer, 1863)

Schriften der Physikalisch-Ökonomischen Gesellschaft zu Königsberg - Physikalisch-Ökonomische Gesellschaft zu Königsberg (In Commission bei Gräfe und Unzer, 1889)

Schriften der Physikalisch-Ökonomischen Gesellschaft zu Königsberg - Physikalisch-Ökonomische Gesellschaft zu Königsberg (In Commission bei Gräfe und Unzer, 1907)

Schriften der Physikalisch-Ökonomischen Gesellschaft zu Königsberg - Physikalisch-Ökonomische Gesellschaft zu Königsberg (In Commission bei Gräfe und Unzer, 1917)