@misc{indiciae24c06883d4f5,
  title = {Land use and land cover and associated maps for Pittsburgh, Pennsylvania},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/ofr77110},
  url = {https://pubs.usgs.gov/publication/ofr77110},
  note = {Source identifier: ofr77110}
}