The Ontario natural science bulletin - Wellington Field Naturalists' Club. (Wellington Field Naturalists' Club, 1909)

Onze flora. Beschrijving van de familiën, voornamste geslachten en soorten der in Nederland in het wild groeiende, verwilderde, verbouwde en aangeplante gewassen, alsmede van eenige fraaie en nuttige midden-europeesche planten - Hoffmann, Carl, 1802 -1883 (W.J. Thieme, 1900)

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

Orchard grass - Oakley, R. A. (Russell Arthur) (Govt. print. off, 1906)

Orchard grass (Dactylis glomerata) - United States. Bureau of Plant Industry, (United States Department of Agriculture, Bureau of Plant Industry, Forage-Crop Investigations, 1915)

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

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

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

Organologisches, systematisches und Arten-Register zu den Tafeln des Handbuch's der botanischen Terminologie - Bischoff, Gottlieb Wilhelm, 1797 -1854 (J.L. Schrag, 1849)

Ornamental plants and farm seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Porter-Walton Co, 1955)

Die Ostsudeten; eine floristische Skizze - Hruby, Johann. (Landesdurch-forschungs-Komemission, 1914)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1896)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1909)

Our 50th anniversary, 1905-1955 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Burnett Bros., Inc, 1955)

Our farm crops. Being a popular scientific description of the cultivation, chemistry, diseases, remedies, &c., of the various crops cultivated in Great Britain and Ireland - Wilson, John, 1812 -1888 (Blackie and son, 1859)

Our seeds grow friends : spring 1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (J. Chas. McCullough Seed Co, 1932)

Our seeds grow friends : spring 1933 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (J. Chas. McCullough Seed Co, 1933)

Outlines of botany : taken chiefly from Smith's Introduction ... For the use of schools and students - Smith, James Edward, 1759 -1828 (Cummings and Hilliard for the author, 1819)

Outlines of British fungology; containing characters of above a thousand species of Fungi, and a complete list of all that have been described as natives of the British Isles - Berkeley, M. J. (Miles Joseph), 1803 -1889 (L. Reeve, 1860)

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

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)

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, 1894)

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, 1896)

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)

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, 1912)

P-W's fall bulbs and plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Porter-Walton Co, 1940)

Le pâturage en forêt / par Alphonse Mathey - Mathey, Alphonse. (Imp. et lith. de P. Jacquin, 1900)

Pacific science - University of Hawaii. (University Press of Hawaii, 1967)

Une page d'histoire de la medecine : la thérapeutique sous les premiers Césars - Lépine, R. (Raphael), 1840 -1919 (F. Alcan, 1890)

Palestine Exploration Fund : quarterly statement - Palestine Exploration Fund. (The Fund, 1888)

Palestine Exploration Fund : quarterly statement - Palestine Exploration Fund. (The Fund, 1892)

Palestine Exploration Fund : quarterly statement - Palestine Exploration Fund. (The Fund, 1893)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1881)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1883)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1884)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1885)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1886)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1887)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1888)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1889)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1891)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1892)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1895)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1896)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1900)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1904)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1914)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1916)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1917)

Pamphlets - Council for Scientific; Industrial Research (Australia) (Govt. Printer, 1918)

[Pamphlets on viticulture] - California Agricultural Experiment Station. (Superintendent of state printing, 1897)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1945)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1953)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1986)

Papers and proceedings of the Royal Society of Tasmania - Royal Society of Tasmania. (The Society, 1877)

Papers on cereal and forage insects. The timothy stem-borer, a new timothy insect [Mordellistena ustulata Lec.] - Phillips, William J. (Govt. Print. Off, 1911)

Papers on Coccidae or scale insects - United States. Bureau of Entomology. (Government Printing Office, 1908)

Les papillons dans la nature : 64 planches en couleurs et monographies - Robert, Paul-A. (Éditions Delachaux and Niestlé, s.a, 1934)

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

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

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)

A Partial bibliography of the mammals of Wyoming and adjacent states with special reference to density and habitat affinity - United States. Bureau of Land Management. (Wyoming Game & Fish Department, 1978)

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

Pasture, meadow, and forage crops in Nebraska - Hitchcock, A. S. (Albert Spear), 1865 -1935 (G.P.O, 1904)

Pasture plants and pastures of New Zealand - Hilgendorf, F. W. 1874 -1942 (Whitcombe & Tombs, limited, 1918)

Pasture plants and pastures of New Zealand - Hilgendorf, F. W. 1874 -1942 (Whitcombe & Tombs, limited, 1919)

Pasture studies: some results - Jenkin, Thomas James, 1885 - (Jarvis & Foster, printers, 1919)

Pastures and pasture plants - Toogood, William G. (Toogood & Sons, 1925)

Pastures and pasture plants - Toogood, William G. (Macmillan and co., ltd, 1897)

Pastures old and new : a plea for the improvement of old turf, better systems of grassing-down, and the prolonged tenure of alternate husbandry grass-layers - Darby, Joseph. (Horace Cox, 1885)

Patologia vegetale. Fanerogame parassite, mixomiceti, bacterii, ifomiceti od eumiceti (funghi) - Voglino, Pietro. (Unione tipografico-editrice [Gia ditta Pomba e c], 1905)

Payne's garden guide [of] seeds, plants & trees : 1922 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1922)

Payne's garden guide [of] seeds, plants and trees - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1918)

Payne's garden guide [of] seeds, plants and trees : 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1919)

Payne's garden guide [of] seeds, plants and trees : 1925 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1925)

Payne's garden guide : seeds, plants & trees - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1921)

Payne's garden guide : seeds, plants & trees - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1920)

Payne's garden guide seeds, plants & trees : 1923 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1923)

Payne's garden guide : seeds, plants and trees - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodore Payne, 1924)

Pellet seeding on western rangelands - United States. Bureau of Land Management. (Agricultural Research Service and Forest Service, U.S. Dept. of Agriculture, 1963)

Pellet seeding on western rangelands - Hull, A. C. (Agricultural Research Service and Forest Service, U.S. Dept. of Agriculture, 1963)

Peninsula Field Naturalists' Club Newsletter - Australia (Peninsula Field Naturalists' Club, 2022)

The Pennsylvania farm journal (A.M. Spangler, 1851)

Performance of several forage species on newly burned lodgepole pine sites - Northern Rocky Mountain Forest; Range Experiment Station (Missoula, Mont.) (Northern Rocky Mountain Forest and Range Experiment Station, 1953)

Permanent and temporary pastures - Sutton, Martin John, 1850 -1913 (Hamilton, Adams & Co, 1888)

Permanent and temporary pastures - Sutton, Martin John, 1850 -1913 (Simpkin, Marshall, Hamilton, Kent & Co, 1891)

Permanent and temporary pastures - Sutton, Martin John, 1850 -1913 (Simpkin, Marshall, Hamilton, Kent, 1911)

Permanent and temporary pastures - Sutton, Martin John, 1850 -1913 (Simpkin, Marshall, Hamilton, Kent & Co, 1908)

Permanent and temporary pastures - Sutton, Martin John, 1850 -1913 (Simpkin, Marshall, Hamilton, Kent & Co., limited, 1911)

Permanent and temporary pastures, with descriptions and coloured illustrations of leading natural grasses and clovers - Sutton, Martin John, 1850 -1913 (Hamilton, Adams, 1887)

Permanent pastures and meadows - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Farmer Seed Co, 1895)