1. Aeromagnetic maps of the Colorado River region including the Kingman, Needles, Salton Sea, and El Centro 1⁰?x 2⁰?quadrangles, California, Arizona, and Nevada Yale Public content 1988. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Colorado River Watershed (Colo.-Mexico).