@misc{indiciae9c49e42ba333,
  title = {Geologic and hydrologic map reports for land-use planning in the Baltimore-Washington urban area},
  author = {A.J. Froelich and John Tilton Hack and E. G. Otton},
  year = {1980},
  doi = {10.3133/cir806},
  url = {https://pubs.usgs.gov/publication/cir806},
  note = {Source identifier: cir806}
}