TY  - RPRT
TI  - Water-resources activities of the U.S. Geological Survey in Pennsylvania, 1986-87
AU  - R. E. Helm
PY  - 1987
DO  - 10.3133/ofr87475
UR  - https://pubs.usgs.gov/publication/ofr87475
ID  - ofr87475
ER  -