@misc{indiciae619961b1774f,
  title = {Geologic map of the Elysium region of Mars},
  author = {K. L. Tanaka and M. G. Chapman and D. H. Scott},
  year = {1992},
  doi = {10.3133/i2147},
  url = {https://pubs.usgs.gov/publication/i2147},
  note = {Source identifier: i2147}
}