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<br />. <br /> <br />ef110 <br /> <br />U.S. DEPARTMENT OF THE INTERIOR <br />GALE A. NORTON, Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br />Charles G. Groat, Director <br /> <br />Any use of trade, product. or firm names in this publication is for descriptive purposes only and does not imply <br />endorsement by the U.S. Government. <br /> <br />For additional information write to: <br /> <br />Copies of this report can be purchased <br />from: <br /> <br />Regional Research Hydrologist <br />U.S. Geological Survey <br />345 Middlefield Road <br />Menlo Park, California 94025 <br />http://water.usgs.gov/nrp <br /> <br />U.S. Geological Survey <br />Information Services <br />Building 810 <br />Box 25286, Federal Center <br />Denver, CO 80225-0286 <br />