@misc{indiciae0629bd409edb,
  title = {High resolution Mariner 9 pictures in the Cydonia region of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/i990},
  url = {https://pubs.usgs.gov/publication/i990},
  note = {Source identifier: i990}
}