@misc{indiciae69e12ae7a4e7,
  title = {Preliminary geologic map of the Beckton Quadrangle, Sheridan County, Wyoming},
  author = {E. N. Hinrichs},
  year = {1980},
  doi = {10.3133/mf1218},
  url = {https://pubs.usgs.gov/publication/mf1218},
  note = {Source identifier: mf1218}
}