@misc{indiciae6c6a24e60760,
  title = {Estimates of undiscovered recoverable resources of conventionally producible oil and gas in the United States; a summary},
  author = {G.L. Dolton and K.H. Carlson and Ronald R. Charpentier and A. B. Coury and R. A. Crovelli and S. E. Frezon and A. S. Khan and J.H. Lister and R. H. McMullin and R. S. Pike and R. B. Powers and E. W. Scott and K. L. Varnes},
  year = {1981},
  doi = {10.3133/ofr81192},
  url = {https://pubs.usgs.gov/publication/ofr81192},
  note = {Source identifier: ofr81192}
}