Helvey, J. D. <br/><br/>
Effects of defoliation by Douglas-fir tussock moth on timing and timing and quantity of stream flow / 
by J. D. Helvey and A. R. Tiedemann 
 - Washington, D. C. :  United States Government Printing Office,  1978 
 - 13 p. ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Streamflow--Mathematical models<br/>Reservoirs--Mathematical models
<br/><br/><label>Dewey Class. No.: </label>627