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

Om Galapagos-hoarnes vegetation - Andersson, N. J. (Nils Johan), 1821 -1880 (Norstedt, 1857)

Om Galapagos-öarnes vegetation - Andersson, N. J. (Nils Johan), 1821 -1880 (Berlingska boktr, 1854)

On the naturalised weeds and other plants in South Australia - Schomburgk, Richard, 1811 -1891 (E. Spiller, Acting Govt. Printer, 1879)

On the study and value of Chinese botanical works : with notes on the history of plants and geographical botany from Chinese sources - Bretschneider, E. (Emil), 1833 -1901 (1871)

Opuscules de botanique (1862-1873) - Jussieu, Antoine Laurent de, 1748 -1836 (1875)

Opuscules entomologiques - Mulsant, Martial Étienne, 1797 -1880 (L. Maison, 1863)

Organographie der Pflanzen, insbesondere der Archegoniaten und Samenpflanzen - Goebel, K. (Karl), 1855 -1932 (G. Fischer, 1898)

Organographie der Pflanzen, insbesondere der Archegoniaten und Samenpflanzen - Goebel, K. (Karl), 1855 -1932 (G. Fischer, 1913)

Organography of plants, especially of the Archegoniata and Spermaphyta - Balfour, Isaac Bayley, 1853 -1922 (Clarendon press, 1900)

Organography of plants, especially of the archegoniatae and spermaphyta - Goebel, K. (Karl), 1855 -1932 (Clar. Press, 1900)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (D. Appleton, 1886)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (Appleton, 1892)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (D. Appleton and Co, 1908)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (K. Paul, Trench, 1884)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (D. Appleton and company, 1902)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (D. Appleton, 1885)

Origin of cultivated plants - Candolle, Alphonse de, 1806 -1893 (Paul, Trench, 1886)

Original notebooks of the botanist, volumes 1 - 4, Peru - Brackenridge, William D. (William Dunlop), 1810 -1893 (1838)

Ornamental and turf manual - Montana. Environmental Management Division. (The Division, 1986)

The ornithological works of Arthur, ninth Marquis of Tweeddale - Wardlaw Ramsay, R. G. (Robert George), 1852 -1921 (Taylor and Francis, 1881)

Ornithologische Monatsberichte (Verlag von R. Friedländer & Sohn, 1902)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1892)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1908)

Ornithologische Monatsschrift - Deutscher Verein zum Schutze der Vogelwelt. (Kommissions-Verlag der Creutschen Verlagsbuchhandlung, 1910)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1902)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1911)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1914)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1913)

Outline of the flora of Trinidad - Crüger, Herman, 1818 -1864 (Peter and Galpin, 1858)

Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) - Leavitt, Robert Greenleaf, 1865 -1942 (American Book Co, 1901)

Outlines of the first course of Yale agricultural lectures - Olcott, Henry Steel, 1832 -1907 (C. M. Saxton, Barker & co, 1860)

Over de bevruchting der bloemen in het kempisch gedeelte van Vlaanderen - MacLeod, Julius, 1857 -1919 (Vuylsteke, 1894)

Pacific rural handbook; containing a series of brief and practical essays and notes on the culture of trees, vegetables and flowers, adapted to the Pacific coast. Also hints on home and farm improvements - Shinn, Charles Howard, 1852 -1924 (Dewey & co, 1879)

Pacific science - University of Hawaii. (University Press of Hawaii, 1950)

Pacific science - University of Hawaii. (University Press of Hawaii, 1951)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1881)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1884)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1896)

[Pamphlets on agriculture in Guam] (s.n, 1905)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1993)

Panicearum genera - Trinius, Carl Bernhard, 1778 -1844 (Impr. de l'Académie impériale des sciences, 1834)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania (The Society, 1969)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania (The Society, 2005)

Parasites and parasitic diseases of horses - Schwartz, Benjamin, 1889 - (U.S. Dept. of Agriculture, 1930)

Parasites and parasitic diseases of horses - Schwartz, Benjamin, 1889 - (U.S. Dept. of Agriculture, 1948)

Parasites and parasitosis of the domestic animals, the zoölogy and control of the animal parasites and the pathogenesis and treatment of parasitic disease - Underhill, Benjamin Mott. (The Macmillan company, 1920)

Parasitology (Cambridge University Press, 1920)

I parassiti vegetali delle piante coltivate od utili - Ferraris, Teodoro. (Sineo & Bo, 1913)

Park's 1940 flower book - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1940)

Park's 1941 flower book - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1941)

Park's flower book : 1962 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Co, 1962)

Park's flower book : season 1938, 70th anniversary - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1938)

Park's illustrated flower book of choice dependable seeds : season of 1929 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park, 1929)

Park's illustrated flower book of choice dependable seeds : season of 1930 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park, 1930)

Park's illustrated flower book of choice dependable seeds : season of 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Company, 1935)

Park's illustrated flower book of choice dependable seeds, season of 1933 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park, 1933)

Park's illustrated flower book of choice dependable seeds, season of 1934 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park, 1934)

Park's illustrated flower book of choice dependable seeds, season of 1937 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1937)

Park's illustrated flower book of choice dependable seeds, season of 1936 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1936)

Part I. The living flora of West Virginia - Millspaugh, Charles Frederick, 1854 -1923 (Wheeling news litho. co, 1913)

The passenger pigeon, its natural history and extinction - Schorger, A. W. (Arlie William), 1884 -1972 (University of Wisconsin Press, 1955)

Pasture grasses and forage plants, and their seeds, weeds, and parasites - Preston, Samuel P. (T. C. Jack, 1887)

Patterson's numbered check-list of North American plants north of Mexico - Patterson, Harry N. (Harry Norton), 1853 -1919 (Patterson, 1892)

Pennsylvania bird life; a manual of the birds of Pennsylvania; treating especially of their food, from examinations of several thousand stomachs, made during all seasons of the year, with descriptions of the birds, their nests, eggs and habits - Warren, Benjamin Harry, 1858 -1926 (Penn'a., Pub by the author, 1892)

Perfil botánico-geológico de la carretera México-Acapulco - Mexico Secretaria de la Economia Nacional. Oficina de Geografia Economica (Talleres Gráficos de la Nación, 1935)

Pesticides documentation bulletin - National Agricultural Library (U.S.) (National Agricultural Library, U.S. Dept. of Agriculture, #c 1965-1969, 1965)