@misc{indiciae587f671d4cf9,
  title = {Preliminary geologic map of Ellipse II-6-1 and vicinity},
  author = {M. J. Grolier},
  year = {1967},
  doi = {10.3133/ofr68114},
  url = {https://pubs.usgs.gov/publication/ofr68114},
  note = {Source identifier: ofr68114}
}