@misc{indiciae8bd69de7fa00,
  title = {Hampstead quadrangle, Maryland: Hydrogeology},
  author = {M.T. Duigon},
  year = {1980},
  doi = {10.3133/ofr80561},
  url = {https://pubs.usgs.gov/publication/ofr80561},
  note = {Source identifier: ofr80561}
}