01029cam a22002891a 4500 agr56000193 DLC 20260227111018.0 791011s1956 dcuab b f001 0 eng c agr56000193 (OCoLC)5517646 U. S. Dept. of Agr. Libr. ViRU DNAL DLC premarc n-us--- S21 .A72 no. 1139 1 Ag84Te no.1139 F821 Clausen, Curtis P. (Curtis Paul), 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 Literature cited: p. 135-143. Includes index. Insect pests Biological control United States. Technical bulletin (United States. Department of Agriculture) ; no. 1139. 11577 11577