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- Roberts, John W. (John William)
- Farmers' bulletin (United States. Dept. of Agriculture) ; no. 1478 1926
- Apple scab, Apples -- Diseases and pests, apples, orchards, fruit trees, plant diseases and disorders, fungal diseases of plants, scab diseases, fungicides, spraying, dusting, spraying equipment, leaf spotting, frogeye leaf spot, leaf blotch, varietal resistance, cultural control, and sulfur
- 12 p. : ill. ; 23 cm.
- U.S. Dept. of Agriculture
- Organic Roots Collection