@misc{indiciae431f9cfb0d97,
  title = {Shaded relief map of the Eastern region of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1982},
  doi = {10.3133/i1321},
  url = {https://pubs.usgs.gov/publication/i1321},
  note = {Source identifier: i1321}
}