@misc{indiciae16689f4698aa,
  title = {Environmental geohydrology, folio No.1 (White Marsh 7 1/2-minute quadrangle)},
  author = {E. G. Otton},
  year = {1974},
  doi = {10.3133/ofr74347},
  url = {https://pubs.usgs.gov/publication/ofr74347},
  note = {Source identifier: ofr74347}
}