1. Altitude of the potentiometric surface and changes in water levels in the Sparta-Memphis aquifer in eastern and southern Arkansas, spring 1986 Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Little Rock, Arkansas : Department of the Interior, U.S. Geological Survey, 1989 Resource Type: Map Access & Availability: Loading
2. Altitude of the top of the Sparta Sand and Memphis Sand in three areas of Arkansas Author/Creator: Pugh, Aaron L., author Publication/Creation: Little Rock, Arkansas : U.S. Geological Survey, 1998 Resource Type: Book Access & Availability: Loading