@misc{indiciae9f00fcdf586d,
  title = {Geologic map of the Purbach Quadrangle of the Moon},
  author = {H. E. Holt},
  year = {1974},
  doi = {10.3133/i822},
  url = {https://pubs.usgs.gov/publication/i822},
  note = {Source identifier: i822}
}