Scale approximately 1:1,000,000 (W 114°49ʹ00ʺ--W 109°02ʹ00ʺ/N 37°00ʹ00ʺ--N 31°19ʹ00ʺ).
Note
Shows drainage basin boundaries and acres of irrigated land. Includes table in margin: Arizona: irrigated acreage by drainage basins, 1949. "The dots represent the acreage of irrigated land reported in each county and drainage basin, but in some cases data were not available for locating dots precisely within the county and drainage basin. Acreages of less than 250 acres in a county and drainage basin are not shown." "U.S. Government Printing Office: 1952 O-205432."