@misc{indiciaef85ad7e97c31,
  title = {Land use and land cover, 1973, Richmond, Virginia; Maryland},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/l140},
  url = {https://pubs.usgs.gov/publication/l140},
  note = {Source identifier: l140}
}