Vansell, Geo. H <br/><br/>
Factors affecting the usefuiness of honeybees in pollination  / 
by Geo. H. Vansell 
 - Washington  :   Department of Agriculture 
 - 32 p. 
 - EUA. Dept. of Agriculture Circular; 650 .
<br/><br/><label>LCCN: </label>202914 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Abejas  Polinización