@misc{indiciaeffbbdb00c51b,
  title = {Preliminary geologic map and coal sections of the SR Springs Quadrangle, Sheridan County, Wyoming},
  author = {W.C. Culbertson and M.C. Klett},
  year = {1975},
  doi = {10.3133/mf727},
  url = {https://pubs.usgs.gov/publication/mf727},
  note = {Source identifier: mf727}
}