Whitten, R. R. <br/><br/>
The internal application of chemicals to kill elm trees and prevent bark-beetle attack  / 
by R. R. Whitten 
 - Washington, D. C.  :   USDA 
 - 12 p. 
 - Circular ; 605 .
<br/><br/> Enc. con impresos similares 
<br/><br/><label>LCCN: </label>206406 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hylurgopinus rufipes<br/>Olmo -- Enfermedades <br/>Olmo -- Plagas 
<br/><br/><label>Dewey Class. No.: </label>PA-C 632 B85