@misc{indiciaecd4db592f9de,
  title = {Map of construction conditions, Prince Georges County, Maryland},
  author = {John Tilton Hack},
  year = {1975},
  doi = {10.3133/ofr75209},
  url = {https://pubs.usgs.gov/publication/ofr75209},
  note = {Source identifier: ofr75209}
}