@misc{indiciae1bf82d2df754,
  title = {Petroleum geology and resources of the Volga-Ural province, U.S.S.R.},
  author = {James A. Peterson and James W. Clarke},
  year = {1983},
  doi = {10.3133/cir885},
  url = {https://pubs.usgs.gov/publication/cir885},
  note = {Source identifier: cir885}
}