[Ruth Underhill was an anthropologist, who] conduct[ed] one of the earliest scientific studies of the earliest scientific studies of the Tohono O'odham of Arizona, a work that would establish Underhill in the profession." Source: www.wikipedia.com This is a brief history of the Navaho up until 1947 when it was completed. This work contains 163 illustrations, some of which are photographs. Five indices are included, one of which shows a map of all the different regions from Alaska, through Canada and all the way into Texas where languages similar to Navaho are spoken.