@misc{indiciae4f1e99d039f1,
  title = {Ground-water problems in the Philadelphia area [Pennsylvania]},
  author = {Jack B. Graham},
  year = {1950},
  doi = {10.2113/gsecongeo.45.3.210},
  url = {https://pubs.usgs.gov/publication/70215334},
  note = {Source identifier: 70215334}
}