@misc{indiciaed1bbf9ce4294,
  title = {Basement and basement-cover relation map of the Appalachian orogen in the United States},
  author = {Avery A. Drake and L. M. Hall and A. E. Nelson},
  year = {1988},
  doi = {10.3133/i1655},
  url = {https://pubs.usgs.gov/publication/i1655},
  note = {Source identifier: i1655}
}