TY  - RPRT
TI  - Ground-water resources of Cambrian and Ordovician carbonate rocks in the valley and ridge physiographic province of Pennsylvania
AU  - A.E. Becher
PY  - 1996
DO  - 10.3133/ofr90109
UR  - https://pubs.usgs.gov/publication/ofr90109
ID  - ofr90109
ER  -