Outline of plan of operations for cooperative protection of crops against grasshoppers during 1939 : (contingent on the availability of necessary federal funds)

Author: United States. Bureau of Entomology and Plant Quarantine. - Hoyt, Avery S., - Wallace, Henry A. (Henry Agard), - United States. Department of Agriculture.
Publisher: Washington DC,Bureau of Entomology and Plant Quarantine 1938

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