@misc{indiciae48d6ddb97815,
  title = {USGS Branch of Petroleum Geology bibliography 1989},
  author = {Helen Colburn},
  year = {1990},
  doi = {10.3133/ofr90674},
  url = {https://pubs.usgs.gov/publication/ofr90674},
  note = {Source identifier: ofr90674}
}