@misc{indiciaedaa63c37536d,
  title = {Geology and coal resources of the Walsenburg area, Huerfano County, Colorado},
  author = {Ross Byron Johnson},
  year = {1958},
  doi = {10.3133/b1042o},
  url = {https://pubs.usgs.gov/publication/b1042O},
  note = {Source identifier: b1042O}
}