@misc{indiciae747d75c51050,
  title = {Geologic map of aggregate resource units for the Baltimore-Washington urban corridor in the Mid-Atlantic region},
  author = {C.S. Southworth and Wayne L. Newell and T. R. Armstrong and Peter Hyde},
  year = {1998},
  doi = {10.3133/ofr98349},
  url = {https://pubs.usgs.gov/publication/ofr98349},
  note = {Source identifier: ofr98349}
}