@misc{indiciaefd6c09bf63cb,
  title = {Macintosh computer display of the history of oil and gas exploration in the Denver basin of Colorado, Nebraska and Wyoming},
  author = {D.K. Higley and K. I. Takahashi and R. F. Mast},
  year = {1990},
  doi = {10.3133/ofr90321},
  url = {https://pubs.usgs.gov/publication/ofr90321},
  note = {Source identifier: ofr90321}
}