USGS Office of Ground Water
Revision Date: 5 March, 2007
Corrected coding forms showing data elements for county and eight-digit hydrologic unit.
For more information, please contact Susan Hutson.
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U.S. Department of the Interior | U.S. Geological Survey URL: http://pubs.usgs.gov/tm/2007/tm4e1/control/revisions.html Page Contact Information: Publications Team Page Last Modified: Monday, 05-Mar-2007 13:07:12 EST