@misc{indiciaea01253ec850d,
  title = {Geologic mapping index to the Death Valley National Monument area, California and Nevada},
  author = {S. P. Schilling and R. A. Thompson},
  year = {1993},
  doi = {10.3133/ofr93506},
  url = {https://pubs.usgs.gov/publication/ofr93506},
  note = {Source identifier: ofr93506}
}