@misc{indiciae926db9307b61,
  title = {The Pumpkin Buttes coal field, Wyoming},
  author = {C. H. Wegemann and R.W. Howell and C. E. Dobbin},
  year = {1929},
  doi = {10.3133/b806a},
  url = {https://pubs.usgs.gov/publication/b806A},
  note = {Source identifier: b806A}
}