Halverson, Howard G. <br/><br/>
A computer program to map tree crown shadows in the urban forest / 
by Howard G. Halverson, Joseph C. Mawson [and] Brian R. Payne 
 - Washington, D. C. :  United States Government Printing Office,  1980 
 - i, 16 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Forests and forestry--United States<br/>Forest ecology--United States
<br/><br/><label>Dewey Class. No.: </label>333.750973