Grasshoppers : a new look at an ancient enemy /
Parker, J. R.(John Robert),1884-
United States.Department of Agriculture.
Washington, D.C. : U.S. Dept. of Agriculture,
1957.
"This bulletin supersedes Farmers' bulletin 1828, Grasshoppers and their control.
Grasshoppers.
Beneficial insects.
Insect pests.