@misc{indiciae29bdcb70a053,
  title = {Geologic map of the Mead quadrangle (V-21), Venus},
  author = {Bruce A. Campbell and David A. Clark},
  year = {2006},
  doi = {10.3133/sim2897},
  url = {https://pubs.usgs.gov/publication/sim2897},
  note = {Source identifier: sim2897}
}