@misc{indiciae4d9c56e41be4,
  title = {Topographic map of the Mare Tyrrhenum Northwest Quadrangle (MC-22 NW) of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1991},
  doi = {10.3133/i2117},
  url = {https://pubs.usgs.gov/publication/i2117},
  note = {Source identifier: i2117}
}