Organized programs to utilize natural enemies of pests in Canada, Mexico, United States : papers presented at the joint symposium, national meeting of the Entomological Society of America, Nov. 30-Dec...
Hyattsville, Md, Plant Protection and Quarantine Programs, Animal and Plant Health Inspection Service, U.S. Dept. of Agriculture, [1976]
U.S. Department of Agriculture, National Agricultural Library
U.S. Department of Agriculture, National Agricultural Library
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