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Gravity data of Nevada / by D.A. Ponce.
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Gravity data of Nevada / by D.A. Ponce.

David A Ponce National Geophysical Data Center.; Geological Survey (U.S.)

Menlo Park, CA : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : USGS Information Services 1997

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Stream water quality in the conterminous United States--status and trends of selected indicators during the 1980's / by Richard A. Smith, Richard B. Alexander, and Kenneth J. Lanfear.

Richard A. Smith 1945- Richard B Alexander

Reston, Va. : U.S. Geological Survey 1994

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