TY  - RPRT
TI  - Sources of data, procedures, and bibliography for coal resource investigation of western Maryland
AU  - Paul C. Lyons
AU  - Edwin F. Jacobsen
PY  - 1981
DO  - 10.3133/ofr81739
UR  - https://pubs.usgs.gov/publication/ofr81739
ID  - ofr81739
ER  -