TY  - RPRT
TI  - Mining and related problems of the shallow hydrogeologic regime, Allegheny County, Pennsylvania
AU  - Seymour Subitzky
PY  - 1975
DO  - 10.3133/mf641c
UR  - https://pubs.usgs.gov/publication/mf641C
ID  - mf641C
ER  -