@misc{indiciae93dcb1e4b2cb,
  title = {Geologic map of Mackay 4 (Grouse) NE Quadrangle, Butte and Custer counties, Idaho},
  author = {Betty Skipp},
  year = {1988},
  doi = {10.3133/ofr88423},
  url = {https://pubs.usgs.gov/publication/ofr88423},
  note = {Source identifier: ofr88423}
}