@misc{indiciae9b444be4b18a,
  title = {Preliminary geologic map of Ellipse II-2-1 and vicinity},
  author = {D.E. Wilhelms},
  year = {1967},
  doi = {10.3133/ofr68328},
  url = {https://pubs.usgs.gov/publication/ofr68328},
  note = {Source identifier: ofr68328}
}