@misc{indiciaec6290b2e13a5,
  title = {Contributions to economic geology, 1920, Part II, Mineral fuels--The Mule Creek oil field, Wyoming},
  author = {E.T. Hancock},
  year = {1921},
  doi = {10.3133/b716c},
  url = {https://pubs.usgs.gov/publication/b716C},
  note = {Source identifier: b716C}
}