TY  - RPRT
TI  - Hydrogeologic framework and generalized shallow ground-water circulation system, Allegheny County, Pennsylvania
AU  - Seymour Subitzky
PY  - 1975
DO  - 10.3133/mf641b
UR  - https://pubs.usgs.gov/publication/mf641B
ID  - mf641B
ER  -