UNITED STATES DEPARTMENT OF AGRICULTURE 
WASHINGTON, D. C. 
ATLAS 
OF 
AMERICAN AGRICULTURE 
Prepared under the Supervision of 0. E. BAKER, Agricultural Economist 
Bureau of Agricultural Economics, H. C. TAYLOR, Chief 
THE PHYSICAL BASIS OF AGRICULTURE 
NATURAL VEGETATION 
GRASSLAND AND DESERT SHRUB 
BY 
H. L. §HANTZ 
Physiologist, Bureau of Plant Industry 
FORESTS 
BY 
RAPHAEL ZON 
Forest Economist, Forest Service 
UBRAIU 
NEW YORI- 
#ajrdsom 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1924 
