1. Base of fresh ground water, approximately 3,000 Micromhos, in the Sacramento Valley and Sacramento-San Joaquin Delta, California Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Menlo Park, California : Department of the Interior, United States Geological Survey, 1973 Resource Type: Map Access & Availability: Loading
2. Ben Hill quadrangle, Georgia, 1954, photorevised 1968 and 1973 : 7.5 minute series (topographic) Author/Creator: Geological Survey (U.S.) Publication/Creation: Washington, D.C. : U.S. Geological Survey ; Reston, Va. : For sale by U.S. Geological Survey : [publisher not identified], 1974 Resource Type: Map Edition: Photorevised 1968 and 1973. Access & Availability: Loading