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Publisher
- Platts5
- Nevada Bureau of Mines, University of Nevada,2
- PennWell MAPSearch,2
- Bank of Montreal, Oil and Gas Department,1
- Commonwealth of Pennsylvania, Dept. of Internal Affairs, Bureau of Topographic and Geologic Survey,1
- Energy Policy Sector,1
- North Dakota Oil & Gas Division :1
- Ohio Dept. of Natural Resources1
- Pennsylvania Bureau of Topographic and Geologic Survey,1
- The Commission,1