Biological control in crop production
Symposium On Biological Control in Crop Production, Beltsvil
Biological control in crop production - London Granada 1981 - 25cm. 461 - Beltsville symposia in agricultural research, 5 .
PEST CONTROL -- BIOLOGICAL CONTROL -- CONGRESSES
PEST CONTROL -- BIOLOGICAL CONTROL -- CONGRE PLANTS, PROTECTION OF -- CONGRESSES
632.96 S99B
Biological control in crop production - London Granada 1981 - 25cm. 461 - Beltsville symposia in agricultural research, 5 .
PEST CONTROL -- BIOLOGICAL CONTROL -- CONGRESSES
PEST CONTROL -- BIOLOGICAL CONTROL -- CONGRE PLANTS, PROTECTION OF -- CONGRESSES
632.96 S99B