@misc{indiciaec666f1864f6d,
  title = {Water in Maryland--a review of the Free State's liquid assets},
  author = {P.N. Walker},
  year = {1969},
  doi = {10.3133/ofr69311},
  url = {https://pubs.usgs.gov/publication/ofr69311},
  note = {Source identifier: ofr69311}
}