The warning service in 1948 : tobacco blue mold, potato and tomato late blight, cucurbit downy mildew
Beltsville, Md, Plant Disease Survey, Division of Mycology and Disease Survey, Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural Research Administration, United States Department of Agriculture, 1948
1948
U.S. Department of Agriculture, National Agricultural Library
U.S. Department of Agriculture, National Agricultural Library
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