@misc{indiciaee74c8f2169f2,
  title = {New Freedom quadrangle, Maryland: Hydrogeology},
  author = {Mark T. Duigon},
  year = {1980},
  doi = {10.3133/ofr801012},
  url = {https://pubs.usgs.gov/publication/ofr801012},
  note = {Source identifier: ofr801012}
}