Ericson, Ruth O. (Ruth Olive), 1897-1961.
Washington, D.C. : Entomology Research Division, Agricultural Research Service, U.S. Dept. of Agriculture, [1961]
1961
Ericson, Ruth O. (Ruth Olive), 1897-1961.
Washington, D.C. : Entomology Research Division, Agricultural Research Service, U.S. Dept. of Agriculture, [1961]
1961