TY  - RPRT
TI  - Large springs in the Valley and Ridge physiographic province of Pennsylvania
AU  - D. A. Saad
AU  - D. J. Hippe
PY  - 1990
DO  - 10.3133/ofr90164
UR  - https://pubs.usgs.gov/publication/ofr90164
ID  - ofr90164
ER  -