@misc{indiciae6817e084cb78,
  title = {Ground-water resources of Chester County, Pennsylvania},
  author = {Laurence J. McGreevy and Ronald A. Sloto},
  year = {1977},
  doi = {10.3133/wri7767},
  url = {https://pubs.usgs.gov/publication/wri7767},
  note = {Source identifier: wri7767}
}