Smithsonian Report, 1945. — Shetrone 



Plate i 



>v 









*< « 



I 1 % 







P£CWA . ] 



■' # 



3** * 



Gi-£r!DALC 



7j@ * 



py 



r /m 











.1-47- C/f£» ;<&l 







^ 



k^r% - - . 



1 i 



fep 



Present-day irrigation in the Salt rive 

 The prehistoric irrigation project covered the 



