@misc{indiciae633af7d97bc6,
  title = {Preliminary geologic map of Ellipse II-11-2 and vicinity},
  author = {N.J. Trask},
  year = {1968},
  doi = {10.3133/ofr68271},
  url = {https://pubs.usgs.gov/publication/ofr68271},
  note = {Source identifier: ofr68271}
}