The principles of biological control :
Sweetman, Harvey Leroy.
The principles of biological control : interrelation of hosts and pests and utilization and regulation of animal and plant populations / by Harvey L. Sweetman. - Dubuque, Iowa : Brown, 1958. - 560 p.
Pest control, Biological.
WA 240
The principles of biological control : interrelation of hosts and pests and utilization and regulation of animal and plant populations / by Harvey L. Sweetman. - Dubuque, Iowa : Brown, 1958. - 560 p.
Pest control, Biological.
WA 240