@misc{indiciae470536091e30,
  title = {Preliminary geologic map of Ellipse II-8-3 and vicinity},
  author = {N.J. Trask},
  year = {1967},
  doi = {10.3133/ofr68270},
  url = {https://pubs.usgs.gov/publication/ofr68270},
  note = {Source identifier: ofr68270}
}