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Kennedy, Michael. 1996. The Global Positioning System and GIS: An Introduction. Chelsea, Michigan: Ann Arbor Press, Inc.
U.S. Environmental Protection Agency. 1992b. Definitions for the Minimum Set of Data Elements for Ground Water Quality. Washington, DC: U.S. Environmental Protection Agency.
U.S. Environmental Protection Agency. 1994. Drinking Water Standard Setting: Question and Answer Primer. Washington, DC: U.S. Environmental Protection Agency.
U.S. Environmental Protection Agency. 1992a. Locational Data Policy Implementation Guidance: Guide to Selecting Latitude / Longitude Collection Methods. Washington, DC: U. S. Environmental Protection Agency.
U.S. Environmental Protection Agency. 1991. Protecting The Nations GroundWater: EPA's Strategy for the 1990s, The Final Report of the EPA Ground Water Task force. Washington, DC: U.S. Environmental Protection Agency.
Rifai, H.S., L.A. Hendricks, K. Kilborn, and P.B. Bedient. 1993. "A Geographic Information System (GIS) User Interface for Delineating Wellhead Protection Areas," Ground Water Vol. 31, No. 3. pg. 480-488.
40 CFR 141.2.
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