@misc{indiciaeccdd0a691836,
  title = {Relation between ground water and surface water in Brandywine Creek basin, Pennsylvania},
  author = {F. H. Olmsted and A. G. Hely},
  year = {1962},
  doi = {10.3133/pp417a},
  url = {https://pubs.usgs.gov/publication/pp417A},
  note = {Source identifier: pp417A}
}