@misc{indiciae05b70bdc3019,
  title = {Evidence of naturally occurring gas hydrates on the North Slope of Alaska},
  author = {T. S. Collett and K.A. Kvenvolden},
  year = {1987},
  doi = {10.3133/ofr87255},
  url = {https://pubs.usgs.gov/publication/ofr87255},
  note = {Source identifier: ofr87255}
}