Zweers G A <br/><br/>
Mechanics of feeding of the Mallard 

 -  1977 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>54857 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Ducle<br/>Animal husbandry
<br/><br/><label>Dewey Class. No.: </label>KZ352:1:3, L7