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Roberts, John W. (John William) , 1882- , Pierce, Leslie.
life cycle (organisms) , apples , orchards , fruit trees , plant diseases and disorders , fungal diseases of plants , leaf blotch , spraying , varietal resistance , sulfur , copper sulfate , Apple blotch , Apples Diseases and pests
- 12 p. : ill. ; 23 cm.
- U.S. Dept. of Agriculture
Organic Roots Collection