@misc{indiciaea15e57ecb2df,
  title = {Digital mineral resource maps of phosphate and natural aggregate for the Pacific Northwest: A contribution to the Interior Columbia River Basin Ecosystem Management Project},
  author = {Arthur A. Bookstrom and Gary L. Raines and Bruce R. Johnson},
  year = {1995},
  doi = {10.3133/ofr95681},
  url = {https://pubs.usgs.gov/publication/ofr95681},
  note = {Source identifier: ofr95681}
}