@misc{indiciae43be32988a44,
  title = {Geologic map of the Beethoven Quadrangle of Mercury},
  author = {J.S. King and D. H. Scott},
  year = {1990},
  doi = {10.3133/i2048},
  url = {https://pubs.usgs.gov/publication/i2048},
  note = {Source identifier: i2048}
}