abstract: … of coal bed. Includes

note: … coal fields keyed

abstract: … outcrops, limits of coal

note: … of the Lehigh Coal

topic: Coal mining

topic: Anthracite coal

topic: Coal

topic: African American coal miners

topic: Coal mining

abstract: … coal mining area, mine

topic: Coal mining

abstract: … Creek Coal Basin showing

note: … maps, Southern Coal

note: Shows "area of workable coal beds," mine

topic: Coal mining

topic: Coal mining

note: … Coal and Navigation

note: …"Constructed from the surveys of the Lehigh Coal

abstract: … showing coal measures

abstract: … categories of "coal measures

note: … Coal Field (in

topic: Anthracite coal

topic: Coal mines and mining

topic: Coal

topic: Coal mines and mining

topic: Coal mining

topic: Coal mining

note: … coal fields

abstract: … coal company locations

abstract: Shows locations of selected rock types, coal

topic: Anthracite coal

topic: Coal mining

topic: Coal mining

topic: Coal mining

topic: Coal mining

topic: Coal mining

topic: Coal mining

topic: Coal miners

note: … and thickness of Clermont Coal

topic: Anthracite coal

topic: Coal mining

topic: Coal mining

topic: Coal mining

collection: … the Penn'a Coal Co.'s gravity road into the coal

collection: … the Penn'a Coal Co.'s gravity road into the coal

topic: Coal miners

note: The Luke Fidler coal breaker

collection: … the Penn'a Coal Co.'s gravity road into the coal