Map of Upper Freeport coal bed outcrop, overburden, mining activity, and related surface subsidence and Redstone coal bed mines, Allegheny, Washington, and Westmoreland Counties, Pennsylvania [map] / by Kent Bushnell and John R. Peak
Includes text, explanation, and county index map of Pennsylvania. Relief indicated by contours and spot heights. "In cooperation with the Appalachian Regional Commission." Preliminary or working copy of study that would become Miscellaneous field studies map 693-B. Base map is faded; data difficult to read or unavailable.