(1972). Fence diagram and geologic column of Pennsylvanian and Upper Mississippian rocks of the Upper Tradewater basin, Kentucky. Washington, D C : United States Department of Interior.
Chicago-viite (17. p.)Fence Diagram and Geologic Column of Pennsylvanian and Upper Mississippian Rocks of the Upper Tradewater Basin, Kentucky. Washington, D C : United States Department of Interior, 1972.
MLA-viite (9. p.)Fence Diagram and Geologic Column of Pennsylvanian and Upper Mississippian Rocks of the Upper Tradewater Basin, Kentucky. Washington, D C : United States Department of Interior, 1972.
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