Marcos Kogan
United States. Department of Agriculture. National Agricultural Library.
United States. Bureau of Entomology
United States. Bureau of Entomology and Plant Quarantine
United States. Bureau of Entomology and Plant Quarantine. Division of Truck Crop and Garden Insects
United States. Bureau of Entomology and Plant Quarantine. Division of Truck Crop and Garden Insects Investigations
United States. Bureau of Entomology and Plant Quarantine. Division of Insecticide Investigations
United States. Bureau of Entomology and Plant Quarantine. Division of Cereal and Forage Insects
Grasshopper Control Conference (1934 Denver)