TY  - BOOK
AU  - Sweetman,Harvey L.
TI  - The principales of biological control : interrelation of hosts and pests and utilization in regulation of animal and plant populations 
U1  - 632.96 21st ed.
PY  - 1958///
CY  - Dubuque
PB  - WM. C. Brown
KW  - Insect pests-Biological control
KW  - Agricultural pests
N1  - Bibliography : pp 452-108 includes index
ER  -