1. Ecuador Author/Creator: United States. Central Intelligence Agency Publication/Creation: [Washington, D.C.] : [Central Intelligence Agency], [1973] Format: Map Access & Availability: Loading
2. Precipitation-frequency atlas of the Western United States Author/Creator: Miller, John F. 1928- (John Frederick), creator Publication/Creation: Silver Spring, Maryland : U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Weather Service, 1973 Format: Map Access & Availability: Loading
3. Flood-prone areas in the San Francisco Bay region, 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
4. 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