@misc{indiciae34ad8d6d5615,
  title = {Geologic map of the Kensington quadrangle, Montgomery County, Maryland},
  author = {Avery Ala Drake},
  year = {1998},
  doi = {10.3133/gq1774},
  url = {https://pubs.usgs.gov/publication/gq1774},
  note = {Source identifier: gq1774}
}