The Bureau of Entomology and Plant Quarantine's place in forest disease and insect control : at the meeting of the Western Forestry and Conservation Association at Portland, Oregon, December 8-9-10, 1...
Washington, D.C, U.S. Department of Agriculture, December 8, 1937
1937
U.S. Department of Agriculture, National Agricultural Library
U.S. Department of Agriculture, National Agricultural Library
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