@misc{indiciaefcb538b17ec2,
  title = {Geologic map of Mackay 4 (Grouse) NW quadrangle, Butte and Custer Counties, Idaho},
  author = {Betty Skipp},
  year = {1989},
  doi = {10.3133/ofr89142},
  url = {https://pubs.usgs.gov/publication/ofr89142},
  note = {Source identifier: ofr89142}
}