Biological control programmes against insects and weeds in Canada, 1959-1968 
[By the Canadian Dept. of Agriculture and Dept. of Fisheries and Forestry] 
 - Slough  Commonwealth Agricultural Bureaux  1971 
 - x, 266 p.  maps  26 cm. 
 - Technical communication  no. 4 .
 - Commonwealth Institute of Biological Control  Technical communication  no. 4 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Weeds--Biological control--Canada<br/>Insect pests--Control--Biological control--Canada
<br/><br/><label>Dewey Class. No.: </label>632  / .96  / 08 s