@misc{indiciaeaf7ffb5c7bec,
  title = {Land use and land cover, 1973, Cumberland, Maryland; West Virginia; Pennsylvania; Virginia},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1982},
  doi = {10.3133/l111},
  url = {https://pubs.usgs.gov/publication/l111},
  note = {Source identifier: l111}
}