@misc{indiciae09de2419ac5e,
  title = {Shaded relief map of the Tritonis Lacus region of Mars (Viking A2 landing site)},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/i1055},
  url = {https://pubs.usgs.gov/publication/i1055},
  note = {Source identifier: i1055}
}