@misc{indiciae3d84d934f9e4,
  title = {Topographic maps of the polar, western, and eastern regions of Mars},
  author = {B.M. Jaovsky and Conway Snyder and M.S. Matthews and Tom Gehrels},
  year = {1991},
  doi = {10.3133/i2160},
  url = {https://pubs.usgs.gov/publication/i2160},
  note = {Source identifier: i2160}
}