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U.S. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br />U.S. GEOLOGICAL SURVEY <br />Gordon P. Eaton, Director <br />Any use of trade, product, or firm names is for descriptive purposes only <br />and does not imply endorsement by the U.S. Government. <br />For additional information, write to: <br />NAWQA - Mail Stop 413 <br />U.S. Geological Survey <br />12201 Sunrise Valley Drive <br />Reston, Virginia 22092 <br />Copies of this report can be purchased from: <br />U.S. Geological Survey <br />Earth Science Information Center <br />Open-File Reports Section <br />Box 25286, MS 517 <br />Denver Federal Center <br />Denver, Colorado 80225