@misc{indiciae145892aa7af4,
  title = {Map of construction conditions, Prince Georges County, Maryland},
  author = {J.T. Hack},
  year = {1976},
  doi = {10.3133/mf768b},
  url = {https://pubs.usgs.gov/publication/mf768B},
  note = {Source identifier: mf768B}
}