Download or read book An Archaeological Survey of the Altar Valley, Sonora, Mexico written by Randall H. McGuire and published by Arizona State Museum. This book was released on 1993 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the results of a survey project that seeks to understand the prehistory of the Trincheras culture in northwest Sonora. The 98 sites recorded range from 2,500 B.C. to historic Tohono O'odham sites from the early 1900's.