@misc{indiciae5e28346a7676,
  title = {Preliminary geologic map of the Bertha 2 NW Quadrangle, Campbell County, Wyoming},
  author = {E. J. McKay},
  year = {1974},
  doi = {10.3133/ofr74173},
  url = {https://pubs.usgs.gov/publication/ofr74173},
  note = {Source identifier: ofr74173}
}