@misc{indiciae02d61e248dde,
  title = {Geology of the National Capital Region: Field trip guidebook},
  author = {William Burton and Scott Southworth},
  year = {2004},
  doi = {10.3133/cir1264},
  url = {https://pubs.usgs.gov/publication/cir1264},
  note = {Source identifier: cir1264}
}