1. Shallow ground water in the Boulder-Fort Collins-Greeley area, Front Range urban corridor, Colorado, 1975-77 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Lakewood, Colorado : U.S. Department of the Interior, U.S. Geological Survey, 1983 Resource Type: Map Access & Availability: Loading
2. Spatial distribution, temporal variability, and chemistry of the salt wedge in the lower Charles River, Massachusetts, June 1998 to July 1999 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2000 Resource Type: Map Access & Availability: Loading