@misc{indiciae660a225bcece,
  title = {Geologic map of the Shakespeare Quadrangle of Mercury},
  author = {John Guest and Ronald Greeley},
  year = {1983},
  doi = {10.3133/i1408},
  url = {https://pubs.usgs.gov/publication/i1408},
  note = {Source identifier: i1408}
}