@misc{indiciae548ae8c9b714,
  title = {Land use and land cover and associated maps for Baltimore, Maryland; Pennsylvania, Virginia, West Virginia},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/ofr77666},
  url = {https://pubs.usgs.gov/publication/ofr77666},
  note = {Source identifier: ofr77666}
}