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Publisher
- Platts17
- Hart Energy Publishing4
- Surveys and Mapping Branch,3
- Geological Survey of Canada,2
- National Energy Information Center (U.S.)2
- PennWell MAPSearch,2
- Platts,2
- State of Tennessee, Dept. of Conservation, Division of Geology,2
- American Association of Petroleum Geologists :1
- Azärbaycan Respublikası Dövlät Torpaq vä Xäritäçäkmä Komitäsi,1
- Central Intelligence Agency,1
- Clarkson Research Services,1
- Commonwealth of Pennsylvania, Dept. of Environmental Resources, Office of Resources Management, Bureau of Topographic and Geologic Survey,1
- Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey,1
- DCNR,1
- Dept. of Conservation,1
- Geological Survey of Canada, Dept. of Mines and Technical Surveys,1
- Geological Survey of Ohio,1
- Geological Survey of Wyoming,1
- Missouri Dept. of Business and Administration, Division of Geological Survey and Water Resources,1