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Publisher
- U.S. Geological Survey,5
- The Survey ;2
- AAPG/Datapages,1
- Bundesamt für Landestopografie,1
- Bundesamt für Landestopographie,1
- CCMW :1
- California Department of Conservation, Division of Mines and Geology,1
- Chishitsu Chōsa Sōgō Sentā,1
- Geological Survey of Canada,1
- Rocky Mountain Association of Geologists,1
- The Survey,1
- U.S. Department of the Interior, U.S. Geological Survey,1
- U.S. Geological Survey ;1
- Virginia Dept. of Mines, Minerals and Energy, Division of Mineral Resources,1