@misc{indiciae520255123142,
  title = {Compositions, ages, and diagenetic histories of the carbonate, sulfide, oxide, and phosphatic concretions at Gay Head, Massachusetts},
  author = {L. J. Poppe and R.F. Commeau and Dennis W. O’Leary},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/70014174},
  note = {Source identifier: 70014174}
}