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- Roberts, John W. (John William) and Pierce, Leslie.
- Apple blotch, Apples, Diseases and pests, life cycle (organisms), apples, orchards, fruit trees, plant diseases and disorders, fungal diseases of plants, leaf blotch, spraying, varietal resistance, sulfur, and copper sulfate
- 12 p. : ill. ; 23 cm.
- U.S. Dept. of Agriculture
- Farmers' bulletin (United States. Dept. of Agriculture) ; no. 1479
- Organic Roots Collection
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