@misc{indiciaefa4b45a5a1e9,
  title = {Shaded relief maps of the eastern, western, and polar regions of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1985},
  doi = {10.3133/i1618},
  url = {https://pubs.usgs.gov/publication/i1618},
  note = {Source identifier: i1618}
}