Archaeological survey of Chihuahua, Mexico to determine the culture groups that may have inhabited or influenced the development of culture in the area.
An examination of clues left by the Red-on-Buff (Hohokam) culture in the vicinity of the Gila Basin as they pertain to understanding the culture; clues including pottery sherds, rubbish mounds, and architectural ruins.
Gladwin compares the previous work done on the architecture of the Flagstaff culture by Colton, Spicer, McGregor and Hargrave with tree-ring dating done by Douglass and McGregor and concludes that the tree-rings dates are in direct conflict.