@misc{indiciae55fee07bd822,
  title = {Petroliferous sand of the Chignik formation at Chignik Lagoon, Alaska},
  author = {Abraham Samuel Keller and John T. Cass},
  year = {1956},
  doi = {10.3133/ofr5671},
  url = {https://pubs.usgs.gov/publication/ofr5671},
  note = {Source identifier: ofr5671}
}