1. Reconnaissance of the ground-water, surface water system in the Zekiah Swamp Run Basin, Charles and Prince Georges Counties, Maryland Author/Creator: Hopkins, Herbert T., 1923- author Publication/Creation: Towson, Maryland : U.S. Geological Survey, 1986 Resource Type: Book Access & Availability: Loading
2. Ground-water availability along the Blue Ridge Parkway, Virginia Author/Creator: Hopkins, Herbert T., 1923- author Publication/Creation: Richmond, Virginia : U.S. Geological Survey, 1984 Resource Type: Book Access & Availability: Loading