@misc{indiciaebd839818ffc1,
  title = {Atlas of urban and regional change, greater Pittsburgh region, Pennsylvania; A. Land use (Level II), 1973},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/ofr7528a},
  url = {https://pubs.usgs.gov/publication/ofr7528A},
  note = {Source identifier: ofr7528A}
}