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Poison bait spreader for grasshopper control Apr. 15, 1939. U.S. Dept. of agriculture. Bureaus of agricultural engineering and entomology and plant quarantine cooperating

by United States. Bureau of Agricultural Engineering

Cover of Poison bait spreader for grasshopper control Apr. 15, 1939. U.S. Dept. of agriculture. Bureaus of agricultural engineering and entomology and plant quarantine cooperating

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Vertebrate pestsPlant pestsPlant health