@misc{indiciaefca4e2d8057a,
  title = {A summary of the methodology and results of regional joint-studies in the central and northern Appalachian Basin conducted by the U.S. Geological Survey as a result of Department of Energy Interagency Agreement No.EX-76-C-01-2287},
  author = {W. J. Perry and G. W. Colton},
  year = {1981},
  doi = {10.3133/ofr811341},
  url = {https://pubs.usgs.gov/publication/ofr811341},
  note = {Source identifier: ofr811341}
}