Biological control of insect pests in the continental United States /
Clausen, Curtis P. 1893-
Biological control of insect pests in the continental United States / by C.P. Clausen. - Washington : U.S. Dept. of Agriculture, 1956. - vi, 151 p. : maps ; 23 cm. - Technical bulletin / United States Department of Agriculture ; no. 1139 . - Technical bulletin (United States. Department of Agriculture) ; no. 1139. .
Includes index.
Literature cited: p. 135-143.
agr56000193
Insect pests--Biological control--United States.
S21 / .A72 no. 1139
1 / Ag84Te no.1139
Biological control of insect pests in the continental United States / by C.P. Clausen. - Washington : U.S. Dept. of Agriculture, 1956. - vi, 151 p. : maps ; 23 cm. - Technical bulletin / United States Department of Agriculture ; no. 1139 . - Technical bulletin (United States. Department of Agriculture) ; no. 1139. .
Includes index.
Literature cited: p. 135-143.
agr56000193
Insect pests--Biological control--United States.
S21 / .A72 no. 1139
1 / Ag84Te no.1139