@misc{indiciaeb866ecfe89fc,
  title = {Shaded relief map of the Syrtis Major Quadrangle of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/i929},
  url = {https://pubs.usgs.gov/publication/i929},
  note = {Source identifier: i929}
}