USGS Open-File Report 98-332


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This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
1U.S. Geological Survey Denver, Colorado.

Central Region Mineral Resources Program

U.S. Department of the Interior
U.S. Geological Survey

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Last updated 07 Dec 2016