@misc{indiciae9827e4d74f34,
  title = {Shaded relief map of the Cydonia region of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/i946},
  url = {https://pubs.usgs.gov/publication/i946},
  note = {Source identifier: i946}
}