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The sugar-beet leaf-spot disease and its control by direct measures
G. H. Coons · U.S. Dept. of Agriculture
20 sayfa · 1930
Control / Sugar beet / Cercospora beticola / Diseases and pests
The plant diseases of importance in the transportation of fruits and vegetables
G. H. Coons · Printed for special distribution by American Railway Perishable Freight Association
59 sayfa · 1918
Farm produce / Transportation / Plant diseases / Diseases and injuries