@misc{indiciae0d5f3d151e6a,
  title = {Occurrence and significance of marine animal remains in American coal balls},
  author = {S.H. Mamay and E. L. Yochelson},
  year = {1962},
  doi = {10.3133/pp354i},
  url = {https://pubs.usgs.gov/publication/pp354I},
  note = {Source identifier: pp354I}
}