@misc{indiciaeb89a9daccbb3,
  title = {Geologic map of the East Lance Creek oil and gas field},
  author = {W.P. Kramer and C. E. Dobbin and R. McMillan},
  year = {1940},
  doi = {10.3133/ofr401},
  url = {https://pubs.usgs.gov/publication/ofr401},
  note = {Source identifier: ofr401}
}