THE BURROW-BUILDER AND ITS USE FOR 
CONTROL OF POCKET GOPHERS 
by 
A. Lorin Ward, Biologist 
Branch of Wildlife Research 
Bureau of Sport Fisheries and Wildlife 
Denver, Colorado 
and 
Dr. Richard M. Hansen, Biologist 
Forestry and Range Management Section 
Colorado State University 
Fort Collins, Colorado 

SPECIAL SCIENTIFIC REPORT -- WILDLIFE NO. 47 
UNITED STATES 
DEPARTMENT OF THE INTERIOR 
FISH AND WILDLIFE SERVICE 
Washington: January 1960 
