@misc{indiciaeac56cbf5605d,
  title = {Preliminary geologic map of the Clavius quadrangle of the Moon},
  author = {David Cummings},
  year = {1969},
  doi = {10.3133/ofr6966},
  url = {https://pubs.usgs.gov/publication/ofr6966},
  note = {Source identifier: ofr6966}
}