94 



The National Geographic Magazine 





4, 



RECLAMATION SERVICE, U.S.G.S. . 

 RELIEF MAP OF THE 



LOWER COLORADO RIVER, 

 SHOWING IRRIGABLE LANDS 



-IN THE—- 



UNITED STATES a MEXICO. 



M ., 



GULF Of 

 ■ A L I r O ft N J A 



