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 Format: Map Access & Availability: Loading
2. Ben Hill quadrangle, Georgia, 1954 : 7.5 minute series (topographic) Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, Va. : The Survey ; Denver, Colo. : For sale by the Survey, 1974 Format: Map Edition: Photorevised 1968 and 1973. Access & Availability: Loading