@misc{indiciaeae9edfc20421,
  title = {Preliminary geologic map, Littrow region of the Moon},
  author = {M. H. Carr},
  year = {1972},
  doi = {10.3133/ofr7262},
  url = {https://pubs.usgs.gov/publication/ofr7262},
  note = {Source identifier: ofr7262}
}