@misc{indiciaeee37a5d2af95,
  title = {Areas of historical oil and gas exploration and production in the conterminous United States},
  author = {Richard F. Mast and D. H. Root and L. P. Williams and W. R. Beeman},
  year = {1995},
  doi = {10.3133/ofr9575c},
  url = {https://pubs.usgs.gov/publication/ofr9575C},
  note = {Source identifier: ofr9575C}
}