@misc{indiciae1990f0ba26d9,
  title = {Geologic map of the Borealis region Mercury},
  author = {M. J. Grolier and J. M. Boyce},
  year = {1984},
  doi = {10.3133/i1660},
  url = {https://pubs.usgs.gov/publication/i1660},
  note = {Source identifier: i1660}
}