1. Lithology, thickness, and extent of hydrogeologic units underlying the East Portland area, Oregon Author/Creator: Hartford, Susan V., author Publication/Creation: Portland, Oregon : U.S. Geological Survey, 1989 Resource Type: Book Access & Availability: Loading
2. Louisiana ground-water map no. 13 : hydrogeologic and potentiometric surface, October 1996, of the Sparta Aquifer in northern Louisiana Author/Creator: Brantly, Jeffrey A. Publication/Creation: Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey, 2002 Resource Type: Map Access & Availability: Loading