TY  - BOOK
AU  - Clausen, C.P.
TI  - Biological control of  insect pests in the continental United States
T2  - Technical bulletin (United States. Department of Agriculture); 1139
U1  - 632.960973 21st ed.
PY  - 1956///
CY  - Washington
PB  - U.S. Department of Agriculture
KW  - Insect pests-Biological control-United States
KW  - Insect pests-Biological control
N1  - Index: pp 144-47
ER  -