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

On some species of Gnathostomulida from Bimini, Bahamas - Kirsteuer, Ernst (American Museum of Natural History, 1969)

On the popular names of British plants : being an explanation of the origin and meaning of the names of our indigenous and most commonly cultivated species - Prior, R. C. Alexander (Richard Chandler Alexander), 1809 -1902 (F. Norgate; [etc., etc.], 1879)

On the popular names of British plants, being an explanation of the origin and meaning of the names of our indigenous and most commonly cultivated species - Prior, R. C. Alexander (Richard Chandler Alexander), 1809 -1902 (Williams & Norgate, 1863)

On the popular names of British plants, being an explanation of the origin and meaning of the names of our indigenous and most commonly cultivated species - Prior, R. C. Alexander (Richard Chandler Alexander), 1809 -1902 (Williams and Norgate, 1870)

Onomatologia Anatomica. Geschichte und Kritik der anatomischen Sprache der Gegenwart, mit besonderer Berücksichtigung ihrer Barbarismen, Widersinnigkeiten, Tropen und grammatikalischen Fehler - Hyrtl, Joseph, 1811 -1894 (W. Braumüller, 1880)

Opera e periodicis collata - Vries, Hugo de, 1848 -1935 (A. Oosthoek, 1918)

Opuscula zoologica - Zoologische Staatssammlung München. (Zoologische Staatssammlung, 1961)

Opuscula zoologica - Zoologische Staatssammlung München. (Zoologische Staatssammlung, 1964)

Opuscula zoologica - Zoologische Staatssammlung München. (Zoologische Staatssammlung, 1969)

Opuscula zoologica - Zoologische Staatssammlung München. (Zoologische Staatssammlung, 1975)

Die Organisation der Turbellaria Acoela. Mit einem Anhange ueber den Bau und die Bedeutung der Chlorophyllzellen von Convoluta roscoffensis - Graff, Ludwig von, 1851 -1924 (W. Engelmann, 1891)

Die Organisation der Turbellaria Acoela - Graff, Ludwig von, 1851 -1924 (W. Engelmann, 1891)

Ornithological dictionary of British birds - Rennie, James, 1787 -1867 (Hurst, Chance, 1831)

Die ostracoden des golfes von Neapel und der angrenzenden meeres-abschnitte - Müller, Gustav Wilhelm, 1857 - (R. Friedlander, 1894)

Outlines of physiology: with an appendix on phrenology - Roget, Peter Mark, 1779 -1869 (Lea and Blanchard, 1839)

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, 1881)

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Oxford gardens, based upon Daubeny's Popular guide to the physick garden of Oxford: with notes on the gardens of the colleges and on the University park - Gunther, R. T. (Robert Theodore), 1869 -1940 (Parker & son; [etc., etc.], 1912)

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

Pacific science - University of Hawaii. (University Press of Hawaii, 1963)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1883)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1884)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1885)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1888)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1890)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1892)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1895)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1904)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1916)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1976)

Parte práctica de botánica del caballero Cárlos Linneo, que comprehende las clases, órdenes, géneros, especies y variedades de las plantas, con sus caracteres genéricos y especificos, sinónimos mas selectos, nombres triviales, lugares donde nacen, y propriedades - Linné, Carl von, 1707 -1778 (En la Imprenta Real, 1784)

The pea aphis with relation to forage crops - Davis, John J. (John June), 1885 -1965 (U.S. Dept. of Agriculture, 1915)

Pflanzen-teratologie systematisch geordnet - Penzig, O. (Ottone), 1856 -1929 (A. Ciminago, 1894)

Die Pflanzendecke Österreich-Ungarns. Auf Grund fremder und eigener Forschungen geschildert - Hayek, August von, 1871 -1928 (F. Deuticke, 1914)

Die Pflanzenfeinde aus der Klasse der Insekten. Ein nach Pflanzenfamilien geordnetes Handbuch sämmtlicher auf den einheimischen Pflanzen bisher beobachteten Insekten zum Gebrauch für Entomologen, Insektensammler, Botaniker, Land- und Forstwirthe und Gartenfreunde - Kaltenbach, J. H. (Johann Heinrich), 1807 -1876 (J. Hoffmann, 1874)

Das Pflanzenleben der Schweiz - Christ, H. (Hermann), 1833 -1933 (F. Schulhess, 1882)

Die Pflanzenwelt von West-Australien südlich des Wendekreises. Mit einer Einleitung über die Pflanzenwelt Gesamt-Australiens in Grundzügen. Ergebnisse einer im Auftrag der Humboldt-Stiftung der Kgl. Preussischen Akademie der Wissenschaften, 1900-1902 unternommenen Reise - Diels, Ludwig, 1874 -1945 (W. Engelmann, 1906)

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The physical basis of heredity - Morgan, Thomas Hunt, 1866 -1945 (Lippincott, 1919)

The Phytologist: a popular botanical miscellany - Newman, Edward, 1801 -1876 (John van Voorst, 1850)

Die Pilze (Fungi) von Tirol, Vorarlberg und Liechtenstein - Magnus, P. (Paul), 1844 -1914 (Verlag der Wagner'schen Universitts-Buchh, 1905)

Plant-breeding - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company, 1915)

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Plant life of Alabama, an account of the distribution, modes of association, and adaptations of the flora of Alabama, together with a systematic catalogue of the plants growing in the state - Mohr, Charles (Charles Theodore), 1824 -1901 (Brown printing co, 1901)

Plant life of Alabama. An account of the distribution, modes of association, and adaptations of the flora of Alabama, together with a systematic catalogue of the plants growing in the state. Prepared in cooperationwith the Geological Survey of Alabama - Mohr, Charles (Charles Theodore), 1824 -1901 (Govt. Print. Off, 1901)

Plant lore, legends, and lyrics. Embracing the myths, traditions, superstitions, and folk-lore of the plant kingdom - Folkard, Richard. (S. Low, Marston, Searle, and Rivington, 1884)

Plant morphogenesis - Sinnott, Edmund W. (Edmund Ware), 1888 -1958 (McGraw-Hill, 1960)

Plant names, scientific and popular, including in the case of each plant the correct botanical name in accordance with the reformed nomenclature, together with botanical and popular synonyms ... - Lyons, A. B. (Albert Brown), 1841 -1926 (Nelson, Baker & Co, 1900)

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Plants of Mississippi : a list of flowering plants and ferns - Lowe, E. N. (Ephraim Noble), 1864 -1933 (Mississippi State Geological Survey, 1921)

The plants of Southern New Jersey with especial reference to the flora of the pine barrens and the geographic distribution of the species - Stone, Witmer. 1866 -1939 (1911)

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Die polycladen (seeplanarien) des golfes von Neapel und der angrenzenden meeres-abschnitte - Lang, Arnold, 1855 -1914 (W. Engelmann, 1884)

Practical forestry. A treatise on the propagation, planting and cultivation, with a description, and the botanical and popular names of all the indigenous trees of the United States - Fuller, Andrew S. (Andrew Samuel), 1828 -1896 (Orange Judd Co, 1884)

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Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1986)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1987)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1988)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1989)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1991)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1993)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1914)

Proceedings of the California Academy of Sciences, 4th series - California Academy of Sciences (California Academy of Sciences, 1915)