The following references were found for Williams, W.A.

• Berseem clover is getting a second chance, 1987
• Registration of 'Multicut' Berseem Clover, 1989
• Berseem Clover N2 Fixation and Forage Production, 1987
• Vetch is an economical source of nitrogen in rice, 1980
• Vetch Green Manure Increases Rice Yields, 1963
• Influence of Temperature on the Growth of Erodium botrys and Trifolium subterraneum, 1975
• Certified Purple Vetch, 1964
• Wollypod Vetch, 1959
• Field infiltration studies with green manures and crop residues on irrigated soils., 1960
• Competition for light between annual species of Trifolium during the vegetative phase, 1963
• Ecological significance of seed coat impermeability to moisture in crimson, subterranean and rose clovers in a Mediterranean-type climate., 1960
• Berseem clover for winter and spring forage production and nitrogen fixation., 1989
• Nitrogen fixation by subclover associations fertilized with sulfur., 1984
• Competition of Erodium botrys and Trifolium subterraneum for Phosphorus., 1975
• The emergence force of forage legume seedlings and their response to temperature., 1963
• Competition for nutrients and light between the annual grassland species Bromus mollis and Erodium botrys., 1968
• Refertilization of rose clover: carryover effects of superphosphate applied in one treatment compared with results from annual applications of same rates., 1957
• Nitrogen fixation by irrigated berseem clover versus soil nitrogen supply, 1990
• The Effects of Winter Cover Crops on Nitrogen Nutrition and Yield of Field Corn, 1989
• Effect of seed weight on the vegetative growth of competing annual Trifoliums, 1968
• Range-legume inoculation and nitrogen fixation by root-nodule bacteria., 1969
• Evaluation of the emergence force exerted by seedlings of small seeded legumes using probit analysis, 1956
• Nitrate and ammonium uptake kinetics of three annual range species., 1988
• Production of sugar beets following winter green manure cropping in california: 1. nitrogen nutrition, yield, disease, and pest status of sugar beets., 1957
• Covercrops for California Agriculture., 1989
• Production of range clovers., 1957
• Management of nonleguminous green manures and crop residues to improve the infiltration rate of an irrigated soil., 1966
• Fertilization of Trifolium Subterraneum L. Growing on Serpentine Soils, 1977
• Dry Matter Contribution by Cotyledons of Lima Beans and Other Epigeal Legumes, 1974
• Yield and Mineral Composition of Grass Species Grown on Acid Grassland Soils, 1967
• Factors affecting competition between subterranean clover and a barley cover crop, 1973

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