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by U. s. Dept. of Agriculture; Chambers, Roger
by U. s. Dept. of Agriculture
by Demaree, J. B.; U. s. Dept of Agriculture; Division of Fruit and Vegetable Crops and Diseases
by U. s. Dept. of Agriculture; Agricultural Research Service; Chambers, Roger
by Dodge, B. O.; Wilcox, R. B.; U. S Dept. of Agriculture; et al.
by U. s. Dept. of Agriculture; Chambers, Sam
by U. s. Dept. of Agriculture; Chambers, Jackson
by U S Dept of Agriculture