TY  - BOOK
AU  - Clausen,Curtis P.
TI  - Biological control of insect pests in the continental United States
T2  - Technical bulletin / United States Department of Agriculture
AV  - S21 .A72 no. 1139
PY  - 1956///
CY  - Washington
PB  - U.S. Dept. of Agriculture
KW  - Insect pests
KW  - Biological control
KW  - United States
N1  - Includes index; Literature cited: p. 135-143
ER  -