@misc{indiciaea978172868b6,
  title = {Eocene diatom chert from Adak Island, Alaska},
  author = {James R. Hein and Hseuh-Wen Yeh and John A. Barron},
  year = {1990},
  doi = {10.1306/212f9165-2b24-11d7-8648000102c1865d},
  url = {https://pubs.usgs.gov/publication/70242783},
  note = {Source identifier: 70242783}
}