@misc{indiciae97bd0be336bf,
  title = {Preliminary geologic map and coal resources of the Gap Quadrangle, Campbell County, Wyoming},
  author = {G.L. Galyardt},
  year = {1974},
  doi = {10.3133/ofr7498},
  url = {https://pubs.usgs.gov/publication/ofr7498},
  note = {Source identifier: ofr7498}
}