00639nam a22002177a 4500003000500000005001700005008004100022010001000063011001000073035001000083040000900093082001600102110004400118245004400162260003700206300002700243490005000270650002200320650002900342830005000371CHAP20220329141714.0971013s1949            r     00010     d  a72554  a73526  a83084  cCHAP  a632.95bC35  aCanada. Department of Lands and Forests  aForest spraying and some effects of DDT  aOntario :bThe Departmnet,c1949  a174 p.b: ilus. ; mapa  aDivision of research biological bulletinv; 214aDDT (Insecticida)14aInsecticidasxToxicidad.0 aDivision of research biological bulletinv; 2