11. Hydrogeology, degradation of ground-water quality, and simulation of infiltration from the Delaware River into the Potomac aquifers, northern Delaware Author/Creator: Phillips, Scott W., author Publication/Creation: Towson, Maryland : U.S. Geological Survey, 1987 Resource Type: Book Access & Availability: Loading
12. Cost-effectiveness of the stream-gaging program in Maryland, Delaware, and the District of Columbia Author/Creator: Carpenter, David H., author Publication/Creation: Towson, Maryland : U.S. Geological Survey, 1987 Resource Type: Book Access & Availability: Loading