Better trees for metropolitan landscapes proceedings of the symposium, held on 4-6 November, 1975, at the U.S. National Arboretum, Washington, D.C. edited by Frank S. Santamour, Jr., Henry D. Gerhold, Silas Little ; sponsored by Agricultural Research Service, USDA, Forest Service, USDA, Pennsylvania State University, in conjunction with Pinchot Consortium for Environmental Forestry Studies
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Classification of Medicago sativa L. using legume characters and flower colors / by Charles R. Gunn, W. H. Skrdla, and H.C. Spencer ; prepared by Agricultural Research Service
Light and plants : a series of experiments demonstrating light effects on seed germination, plant growth, and plant development / [by R.J. Downs, H.A. Borthwick and A.A. Piringer]
Title:
Series of experiments demonstrating light effects on seed germination, plant growth, and plant development