Black walnut on Kansas strip mine Spols :  some observation 25 years after pruning / 
by Alex L. Shigo...[et al] 
 - Broomall :  Forest Service ,  1978 
 - 14 p. :  ill.,photoes ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pruning<br/>Plant biotechnology
<br/><br/><label>Dewey Class. No.: </label>631.542