@misc{indiciae0cf7cbd46dba,
  title = {Lithotectonic terrane map of the western conterminous United States},
  author = {Norman J. Silberling and D. L. Jones and M.C. Blake and D. G. Howell},
  year = {1987},
  doi = {10.3133/mf1874c},
  url = {https://pubs.usgs.gov/publication/mf1874C},
  note = {Source identifier: mf1874C}
}