Soil survey of Yuma-Wellton area, parts of Yuma County, Arizona, and Imperial County, California

Barmore, R.L., 1980, Soil survey of Yuma-Wellton area, parts of Yuma County, Arizona, and Imperial County, California: U.S. Department of Agriculture, Soil Conservation Service and University of Arizona, Agricultural Experiment Station, and California Agricultural Experiment Station, 104 p., 100 sheets.