@misc{indiciae0769a26dbbda,
  title = {Coal resources of Cowlitz River valley, Cowlitz and Lewis Counties, Washington},
  author = {A. J. Collier},
  year = {1913},
  doi = {10.3133/b531l},
  url = {https://pubs.usgs.gov/publication/b531L},
  note = {Source identifier: b531L}
}