Clausen, Knud E. <br/><br/>
Yeild and quality of seed from yellow birch progenies / 
by Knud E.Clausen 
 - Washington,D.C. :  United States Department of Agriculture,  1980 
 - 5 p. ;  26 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Seeds<br/>Seeds--descriptive botany
<br/><br/><label>Dewey Class. No.: </label>581.467