Insect liberations in Canada :   parasites and predators = Lachers d'insectes aud Canada :   parasites et predateurs / 
by G.D. Williamsun, comp. 
 - Otawa :   Research Branch Agriculture Canada 
 - v 
<br/><br/> La biblioteca tiene 1976,  1978, 1979, 1980 
<br/><br/><label>LCCN: </label>205186 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insectos parásitos y predatores