@misc{indiciaef37dc23c94fa,
  title = {Geologic map of the Schiller quadrangle of the Moon},
  author = {Terry W. Offield},
  year = {1971},
  doi = {10.3133/i691},
  url = {https://pubs.usgs.gov/publication/i691},
  note = {Source identifier: i691}
}