Perry Seed Company, 1931 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perry Seed Company, 1931)

Perry Seed Company, 1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perry Seed Company, 1932)

Peter Henderson & Co's tested seeds : dealers' wholesale catalogue, for season 1894 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Peter Henderson & Co, 1894)

Pflanzen-geographie auf physiologischer Grundlage - Schimper, A. F. W. (Andreas Franz Wilhelm), 1856 -1901 (Gustav Fischer, 1908)

Pflanzenbiologische Studien - Lundström, Axel Nikolaus, 1847 -1905 (Druck der Akademischen Buchdruckerei, Edv. Berling, 1884)

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

Die Pflanzenwelt Norwegens. Ein Beitrag zur Natur- und Culturgeschichte Nord-Europas - Schübeler, F. C. (Frederik Christian), 1815 -1892 (A.W. Brögger, 1873)

Die Pflanzenwelt Norwegens : ein Beitrag zur Natur- und Culturgeschichte Nord-Europas - Schübeler, F. C. (Frederik Christian), 1815 -1892 (1873)

Die Phanerogamen - Flora Oesels und der benachbarten Eilande und Beitrag zur Flora der Insel Runoe - Sass, Arthur, Baron von. (Druck von H. Laakmann, 1860)

Photographs of drawings of 350 of the commoner weed seeds found in commercial seeds - Hillman, F. H. (U.S. Bureau of Plant Industry, Seed Laboratory, 1916)

The physiology of the pollen of Zea mays : with special regard to vitality - Andronescu, Demetrius Ion. (1915)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1978)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 2010)

The Phytologist: a botanical journal - Irvine, Alexander, 1793 -1873 (William Pamplin, 1858)

The Phytologist: a botanical journal - Irvine, Alexander, 1793 -1873 (William Pamplin, 1860)

The Phytologist: a botanical journal - Irvine, Alexander, 1793 -1873 (William Pamplin, 1862)

The Phytologist: a popular botanical miscellany - Newman, Edward, 1801 -1876 (John van Voorst, 1841)

Phytoneuron (Guy L. Nesom, 2013)

Phytoneuron (Guy L. Nesom, 2015)

Phytoneuron (Guy L. Nesom, 2019)

Phytopathologie. Die krankheiten der culturgewächse. Für land- und forstwirthe, gärtner und botaniker - Hallier, Ernst, 1831 -1904 (W. Engelmann, 1868)

Die Pilze Böhmens - Bubák, František, 1866 -1925 (In Commission bei F. ivna, 1908)

Die pilze in morphologischer, physiologischer, biologischer und systematischer beziehung - Zopf, W. (Wilhelm), 1846 -1909 (E. Trewendt, 1890)

Die Pilze Schlesiens - Schroeter, J. (J.U. Kern's Verlag, 1889)

Pitcher & Manda catalogue of flower and vegetable seeds and bulbs for spring planting - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pitcher & Manda, 1895)

The plain truth about seeds : Burpee's 1899 farm annual - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (W. Atlee Burpee & Co, 1899)

Plant & eat vegetables for health : 1936 seed annual - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Abel's Seed House, 1936)

Plant associations of region two : potential plant communities of Wyoming, South Dakota, Nebraska, Colorado, and Kansas - Johnston, Barry C. (USDA Forest Service, Rocky Mountain Region, 1987)

Plant community types of sand dunes and sand plains in selected areas of the boreal natural region - Alberta. Alberta Sustainable Resource Development. (The Company, 2005)

Plant diseases in Montana in 1928 - Morris, H. E. (Office of Mycology and Disease Survey, Bureau of Plant Industry, United States Department of Agriculture, 1929)

Plant diseases in Utah in 1927 - United States. Office of Mycology; Disease Survey. (Office of Mycology and Disease Survey, Bureau of Plant Industry, United States Department of Agriculture, 1928)

Plant-geography upon a physiological basis - Balfour, Isaac Bayley, 1853 -1922 (Clarendon Press, 1903)

Plant-geography upon a physiological basis. Translated by W.R. Fisher; rev. and edited by Percy Groom and I.B. Balfour - Schimper, A. F. W. (Andreas Franz Wilhelm), 1856 -1901 (Clarendon Press, 1903)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1923)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1929)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1934)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1942)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1956)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1958)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1966)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1968)

Plant inventory - United States. Agricultural Research Service. (Northeastern Region, Agricultural Research Center-West, 1969)

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 - 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)

The plant life of Maryland - Shreve, Forrest, 1878 -1950 (Johns Hopkins Press, 1910)

Plant responses to salinity : an indexed bibliography (Office of the Regional Administrator for Agricultural Research (Western Region), Science and Education Administration, U.S. Department of Agriculture, 1978)

Plant sturdy seeds 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Weeber & Don, 1919)

Plant sturdy seeds : 1920 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Weeber & Don, 1920)

The Plant world - Plant World Association. (Plant World Association [etc.], 1918)

Plantes fourragères prairies et pâturages - Malte, M. O. (Malte Oscar), 1880 -1933 (Impr. du gouvernement, 1913)

Plantes fourragères prairies et pâturages - Malte, M. O. (Malte Oscar), 1880 -1933 (Ministre de l'Agriculture, 1913)

Plants and their environments proceedings of the first biennial scientific conference on the greater Yellowstone ecosystem - United States. National Park Service. (U.S. Dept. of the Interior, National Park Service, Natural Resources Publication Office, 1995)

Plants from the Swauk - Sharples, Stephen Paschall, 1842 -1923 (1913)

Plants of Iowa; a preliminary list of the native and introduced plants of the state, not under cultivation - Greene, Wesley. (Bishard brothers, printers, 1907)

The plants of Michigan; simple keys for the identification of the native seed plants of the state - Gleason, Henry A. (Henry Allan), 1882 -1975 (G. Wahr, 1918)

The plants of Prince Edward Island - Erskine, D. S. (David Sterling) (Research Branch, Agriculture Canada, 1985)

The plants of Prince Edward Island - Erskine, D. S. (David Sterling) (Plant Research Institute, Research Branch, Canada Dept. of Agriculture, 1960)

Plants of Riding Mountain National Park, Manitoba - Canadian Parks Service. (Research Branch, Agriculture Canada, 1988)

Plants of Yellowstone National Park - McDougall, W. B. (Walter Byron), 1883 - (U.S. Govt. Print. Off, 1936)

Poisonous plants of the Midwest - University of Illinois at Urbana-Champaign. Dept. of Landscape Architecture. (Dept. of Landscape Architecture, University of Illinois, 1983)

A popular flora of Denver, Colorado - Eastwood, Alice, 1859 -1953 (Zoe Publishing Company, 1893)

Popular names of flowers, fruits, &c., as used in the county of Somerset and the adjacent parts of Devon, Dorset and Wilts - Macmillan, Alexander Stuart. (Western Gazette, 1922)

The Popular science monthly - Harry Houdini Collection (Library of Congress) (Popular Science Pub. Co., etc, 1893)

The Popular science monthly - Harry Houdini Collection (Library of Congress) (Popular Science Pub. Co., etc, 1872)

Populäre Botanik oder gemeinfassliche Anleitung zum Studium der Pflanze und des Pflanzenreiches. Zugleich ein Handbuch zum Bestimmen der Pflanzen auf Excursionen - Schmidlin, Eduard, 1808? -1890 (Krais & Hoffmann, 1857)

Populäres handbuch des grasbaus, futterpflanzenbaus und der milchwirthschaft - Hoffman, Francis Arnold 1822 -1903 (Wis., G. Brumder, 1883)

Portland Seed Co's catalogue : 1901 seeds and garden supplies - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Portland Seed Co, 1901)

Portland Seed Company's catalog and seed annual for 1922 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Portland Seed Co, 1922)

Portland Seed Company's complete catalog and seed annual for 1921 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Portland Seed Co, 1921)

Potato leaf roll and its insect vectors in the Edmonton District - University of Alberta. Dept. of Entomology. ([University of Alberta], 1945)

The potentialities of revegetating and utilizing agronomic species on strip mined areas in Illinois - University of Illinois at Urbana-Champaign. Agricultural Experiment Station. (University of Illinois, Agricultural Experiment Station, 1947)

A practical guide to garden plants, containing descriptions of the hardiest and most beautiful annuals and biennials, hardy herbaceous and bulbous perennials, hardy water and bog plants, flowering and ornamental trees and shrubs, conifers; hardy ferns; hardy bamboos and other ornamental grasses. Also the best kinds of fruits and vegetables that may be grown in the open air in the British Isles with full and practical instruction as to culture and propagation - Weathers, John, 1867 -1928 (Longmans, Green, 1901)

Practical guide to the wild flowers and fruits - Walton, George Lincoln, 1854 -1941 (J.B. Lippincott company, 1909)

Practical guide to the wild flowers and fruits - Walton, George Lincoln, 1854 -1941 (Lippincott, 1909)

Practical notes on grasses & grass growing in East Anglia - Everitt, Nicholas. (Jarrold, 1897)

Practical observations on agricultural grasses and other pasture plants - Wilson, William, junior. (Simpkin, Marshall, & Co, 1889)

A practical treatise on the hive and honey-bee - Langstroth, L. L. (Lorenzo Lorraine), 1810 -1895 (C. M. Saxton & co, 1857)

A preliminary catalogue of the flora of New Jersey - Britton, Nathaniel Lord, 1859 -1934 (Office of the Survey, 1881)

... A preliminary catalogue of the flora of New Jersey - Britton, Nathaniel Lord, 1859 -1934 (Office of the survey, 1881)

Preliminary inventory of Canadian weeds - Crompton, Clifford W. (Agriculture Canada, Research Branch, 1988)

A preliminary list of the parasitic fungi of Idaho - United States. Division of Mycology; Disease Survey. (Division of Mycology and Disease Survey, Bureau of Plant Industry, United States Department of Agriculture, 1936)

A preliminary list of the vascular flora of Allegheny County, Pennsylvania - Shafer, John Adolph, 1863 -1918 (Carnegie Institute Museum?, 1901)

Preliminary report on the alfalfa weevil. [Phytonomus posticus] - Webster, F. M. (Francis Marion), 1849 -1916 (Govt. print. off, 1912)

Price list and descriptive catalogue for 1909 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Barteldes Seed Co, 1909)

Price list of agricultural seeds, and treatise on permanent pasture grasses and the adulteration of their seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (James Hunter, 1910)

Prima lineae florae Herbipolensis - Lehmann, Johann Friedrich. (Nitribitt, 1809)

The principles of agriculture, a text-book for schools and rural societies - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company, 1919)

The principles of agriculture; a text-book for schools and rural societies - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company, 1918)

The principles of agriculture; a text-book for schools and rural societies - Bailey, L. H. (Liberty Hyde), 1858 -1954 (Macmillan, 1913)

The principles of agriculture; a text-book for schools and rural societies - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company, 1898)

The principles of agriculture, a text-book for schools and rural societies - Bailey, L. H. (Liberty Hyde), 1858 -1954 (1914)

The principles of agriculture; a text-book for schools and rural societies - Bailey, L. H. (Liberty Hyde), 1858 -1954 (The Macmillan company, 1909)

The principles of agronomy; a text-book of crop production for high-schools and short-courses in agricultural colleges - Harris, Franklin Stewart, 1884 -1960 (The Macmillan company, 1915)

Principles of soil microbiology - Waksman, Selman A. (Selman Abraham), 1888 -1973 (Williams & Wilkins, 1927)

Prirodoslovna istraživanja - Jugoslavenska akademija znanosti i umjetnosti. (1916)

Proceedings - Dorset Natural History; Archaeological Society.

Proceedings - Nova Scotian Institute of Science. (1866)

Proceedings and transactions of the Natural History Society of Glasgow - Natural History Society of Glasgow. (The Society, 1886)

Proceedings and transactions of the Natural History Society of Glasgow - Natural History Society of Glasgow. (The Society, 1889)

The Proceedings and transactions of the Nova Scotian Institute of Science - Nova Scotian Institute of Science. (Nova Scotian Institute of Science, 1894)

The Proceedings and transactions of the Nova Scotian Institute of Science - Nova Scotian Institute of Science. (Nova Scotian Institute of Science, 1906)

Proceedings and transactions of the Royal Society of Canada. Délibérations et mémoires de la Société royale du Canada - Royal Society of Canada. (Société royale du Canada, 1920)

Proceedings - Dorset Natural History and Archaeological Society - Dorset Natural History; Archaeological Society. (1877)

Proceedings of the 36th Southern Pasture and Forage Crop Improvement Conference : May 1-3, 1979, Beltsville, Maryland - Auburn University. Agricultural Experiment Station. (Agricultural Research (Southern Region), Science and Education Administration, U.S. Dept. of Agriculture, 1979)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1877)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1892)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1902)

Proceedings of the Academy of Natural Sciences of Philadelphia - Academy of Natural Sciences of Philadelphia. (Academy of Natural Sciences of Philadelphia, 1909)

Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge - American Philosophical Society. (American Philosophical Society, 1922)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1886)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1884)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1892)

Proceedings of the Biological Society of Washington - Smithsonian Institution (Biological Society of Washington, 1901)

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

Proceedings of the Boston Society of Natural History - Boston Society of Natural History. (Boston Society of Natural History, 1923)