. Bulletin. Plant diseases -- United States. Bull. 20, Div. Veg. Phys & Path , U. S. Dept. of Agriculture. Plate XIX. c â H c l- 2 m en J- en g O = CD 5 en -â O i z â m c > ^ H 1 a > H 33 m. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Vegetable Physiology and Pathology. Washington : G. P. O.

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