Effectiveness of douglas-fir beetle antiaggregative pheromone applied by helicopter/ 
Malcolm M. Furniss...[et al.] 
 - Washington, D.C. :  U.S. Dept. of Agriculture, Forest Service,  1981 
 - 6 p. :  ill. ;  28 cm. 
 - General technical report ;  no. INT-101 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Helicopters
<br/><br/><label>Dewey Class. No.: </label>387.73352