@misc{indiciae91ef86c55a9d,
  title = {Preliminary geologic map of the Rumker quadrangle of the moon},
  author = {R. E. Eggleton and E.I. Smith},
  year = {1968},
  doi = {10.3133/ofr6893},
  url = {https://pubs.usgs.gov/publication/ofr6893},
  note = {Source identifier: ofr6893}
}