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George C. Papavizas, Chairman. 1981. Beltsville Symposia in Agriculture Research. Biological Control in Crop Production, Volume 5, 461 pages. A symposium held May18-21, 1980 at the Beltsville Agricultural Research Center (BARC), Maryland 20705. Organized by the BARC Symposium Committee. Sponsored by BARC, Northeast Region, Science and Education Administration, United States Department of Agriculture (USDA).
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