i 6 The National Geographic Magazine 



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No. l. Map showing Arid, Semi- Arid, and Humid Regions of the 



United States 



129° 12i>° 121" 117° 113° 109° 105° 101° 97' 93° 89° 8o° 81" 



73° 69" 65" 



117° 113° 10'J 3 10>° 101 s 97' 



No. 2. Map showing Mean Annual Rainfall in the United States 



