11. Water-level maps of the Mississippi River Valley alluvial aquifer in eastern Arkansas, 1987 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Little Rock, Ark.] : U.S. Department of the Interior, U.S. Geological Survey, 1990 Resource Type: Map Access & Availability: Loading
12. Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia--analysis of available ground-water-quality data through 1987 Author/Creator: Hamilton, Pixie A. Publication/Creation: Denver, CO : For sale by the Books and Open-File Reports Section, U.S. Geological Survey Resource Type: Book Access & Availability: Loading