GEOGRAPHIC DISTRIBUTION OF THE 
PINES OF THE WORLD 
by 
WILLIAM. B. CRITCHFIELD 
Geneticist 
Pacific Southwest Forest and Range Experiment Station 
Forest Service, Berkeley, Calif. 
and 
ELBERT L. LITTLE, JR. 
Dendrologist 
Division of Forest Management Research 
Forest Service, Washington, D.C. 
Miscellaneous Publication 991 
U.S. DEPARTMENT OF AGRICULTURE FOREST SERVICE 
WASHINGTON, D.C. FEBRUARY 1966 
