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Publisher
- Petroleum Economist10
- Petroleum Economist Ltd5
- Kentucky Geological Survey4
- Kentucky Geological Survey,A. Hoen & Co.4
- Kentucky Geological Survey,Williams-Webb Co.3
- Central Intelligence Agency2
- Kentucky Geological Survey,Williams & Heintz Co.2
- F.E. Gallup Map Co.1
- Kentucky Department of Mines and Minerals1
- publisher not identified1
