@misc{indiciaeee39c8cf00e3,
  title = {Shaded relief of the Tir quadrangle of Mercury (Phaethontias Albedo Province)},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1976},
  doi = {10.3133/i993},
  url = {https://pubs.usgs.gov/publication/i993},
  note = {Source identifier: i993}
}