@misc{indiciaee7cc104f925a,
  title = {Geologic map of the Piedmont in the Beltsville, Laurel, and Washington East quadrangles, Montgomery, Prince Georges, Howard, and Anne Arundel Counties, Maryland and the District of Columbia},
  author = {Avery A. Drake},
  year = {1998},
  doi = {10.3133/ofr98520},
  url = {https://pubs.usgs.gov/publication/ofr98520},
  note = {Source identifier: ofr98520}
}