Hough, Walter. <br/><br/>
Antiquities of the upper Gila and Salt River Valleys in Arizona and New Mexico /  
by Walter Hough. 
 - Washington :   Government Printing Office,   1907. 
 - 96 p. :   il. ;   24 cm. 
 - Bureau of American ethnology Bulletin ;   35 .
 - Bureau of American ethnology Bulletin ;   35 .