Dyfyniad APA

(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.

Dyfyniad Arddull Chicago

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.

Dyfyniad MLA

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.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.