@misc{indiciaeca03679edb4a,
  title = {Map showing major fold axes, satellite-imagery lineaments, elongate aeroradioactivity anomalies, and lines of structural discontinuity, southwestern Pennsylvania and vicinity},
  author = {R. P. Briggs and W. R. Kohl},
  year = {1976},
  doi = {10.3133/mf815},
  url = {https://pubs.usgs.gov/publication/mf815},
  note = {Source identifier: mf815}
}