@misc{indiciae20a4f4aa59c6,
  title = {Shaded relief map of the Diacria Quadrangle of Mars},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/i989},
  url = {https://pubs.usgs.gov/publication/i989},
  note = {Source identifier: i989}
}