(AMERICAN SOUTHWEST.) U.S. Army Corps of Engineers; and U.S. Geological Survey. Key Map Showing Status of Map Work in Eighth Corps Area. Large blue-printed survey plat of Texas, Oklahoma, Colorado, New Mexico, and Arizona. 31 1/2x35 3/4 inches sheet size, wide margins; partial hand-color in southern Texas; scattered manuscript annotations, folds, age tone, other small defects. OCLC records one example, University of Arizona. Washington, D.C.: Engineer Reproduction Plant, early 1930s
