1. Nitrate in the Columbia aquifer, central Delmarva Peninsula, Maryland Author/Creator: Bachman, L. Joseph, author Publication/Creation: Towson, Maryland : U.S. Geological Survey, 1984 Resource Type: Book Access & Availability: Loading
2. Numerical simulation of the high plains regional aquifer, northwestern Oklahoma Author/Creator: Havens, John S., author Publication/Creation: Oklahoma City, Oklahoma : U.S. Geological Survey, 1984 Resource Type: Book Access & Availability: Loading