Jeffers, Richard M. <br/><br/>
Twenty-year results of the lake states jack pine seed source study / 
by Richard M. Jeffers 
 - Washington :  United States Government Printing Office,  1980 
 - Various pagings :  ill. ;  28 cm. 
 - Research paper ;  NC-181 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Seeds<br/>Forest service
<br/><br/><label>Dewey Class. No.: </label>634.987