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U.S. Geological Survey
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Columbia
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1. World Geologic Provinces, 2000
2000. Lee M. Osmonson, USGS, Denver, CO (comp.), Feliks M. Persits, Contractor to USGS, Denver, CO (comp.), Douglas W. Steinshouer, Contractor to USGS, Denver, CO, and Timothy R. Klett, USGS, Denver, CO (comp.) and others. Geologic Provinces is a polygon theme representing U.S. Geological Survey defined geologic provinces of the World. Each province has a set of geol... U.S. Geological Survey.
2. World Ore Deposits, 1999
1972. David G. Frank. Ore Deposits is a point theme representing ore deposits throughout the world, locational and attribute information is taken from the 1999 Mineral R... U.S. Geological Survey.