SOIL CONSERVATION SERVICE 
PLANT GROWTH REGIONS OF THE UNITED STATES 
U. S. DEPARTMENT OF AGRICULTURE 
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12 Northern Rocky Mountains. 
6 columbia River Valley. 
1937 
Map prepared by Cartographic Drafting Unit 
Figure 1 
Plant Growth Regions by Furfnan Lloyd Mulford, Bureau of Plant Industry, U.S.D.A. 
