Pennsylvania vegetable growers' news - Pennsylvania Vegetable Growers' Association. (Pennsylvania Vegetable Growers' Association, 1945)

Perennial, biennial and annual plants, iris, cut garden flowers in season : spring 1935 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Bright Spot Gardens, 1935)

Perennial, biennial and annual plants, iris, cut garden flowers in season : spring 1934 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Bright Spot Gardens, 1934)

Perfegro hi-quality seeds : 1941 catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rocky Mountain Seed Company, 1941)

Perfegro hi-quality seeds : 1942 catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rocky Mountain Seed Company, 1942)

Perfegro hi-quality seeds : 1943 catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rocky Mountain Seed Company, 1943)

Perfegro hi-quality seeds : 1944 catalogue - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rocky Mountain Seed Company, 1944)

Perithecia of Thielavia basicola Zopf in culture and the stimulation of their production by extracts from other fungi - McCormick, Florence Anna 1874 -1964 (Connecticut Agricultural Experiment Station, 1925)

Perkins' garden annual, 1942 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perkins Seed Store, 1942)

Perkins' garden annual, 1944 : with complete planting guide for home gardens - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perkins Seed Store, 1944)

Perry's seeds, 1935 : lawn, vegetable and flower seeds, bulbs, plants, garden and poultry supplies - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perry Seed Company, 1935)

Perry's seeds and garden requisites, 1934 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Perry Seed Company, 1934)

Perspectives and horizons in microbiology, a symposium - Waksman, Selman A. (Selman Abraham), 1888 -1973 (Rutgers University Press, 1955)

Pest control by chemical, biological, genetic, and physical means; a symposium. Chairman: E. F. Knipling ... presented at the meeting of the American Association for the Advancement of Science, Section 0 on Agriculture, December 26-31, 1964 - Knipling, E. F. (Agricultural Research Service, U.S. Dept. of Agriculture, 1966)

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