@misc{indiciae2d2d0563bd61,
  title = {Geologic maps of the French Butte and Greenhorn Buttes quadrangles, Washington},
  author = {Donald A. Swanson},
  year = {1989},
  doi = {10.3133/ofr89309},
  url = {https://pubs.usgs.gov/publication/ofr89309},
  note = {Source identifier: ofr89309}
}