@misc{indiciae69bd0040e27c,
  title = {Preliminary geologic map of the Colville Indian Reservation, Ferry and Okanogan Counties, Washington, with a table of potassium-argon ages},
  year = {1984},
  doi = {10.3133/ofr84389},
  url = {https://pubs.usgs.gov/publication/ofr84389},
  note = {Source identifier: ofr84389}
}