@misc{indiciaebe47b86d5dfb,
  title = {An index of continuous-tone photographic prints of the digital shaded-relief map of the United States; whole or in six sections},
  author = {Richard J. Pike and Gail P. Thelin and Chip P. Stevens},
  year = {1992},
  doi = {10.3133/ofr92256},
  url = {https://pubs.usgs.gov/publication/ofr92256},
  note = {Source identifier: ofr92256}
}