@misc{indiciae109c809de562,
  title = {Development of a digital model of ground-water flow in deeply weathered crystalline rock, Chester County, Pennsylvania},
  author = {Laurence J. McGreevy and Ronald A. Sloto},
  year = {1980},
  doi = {10.3133/wri802},
  url = {https://pubs.usgs.gov/publication/wri802},
  note = {Source identifier: wri802}
}