@misc{indiciaebb14478fd475,
  title = {An organic origin for the carbonate concretions of the Ohio Shale},
  author = {R.E. Criss and G.A. Cooke and S.D. Day},
  year = {1988},
  doi = {10.3133/b1836},
  url = {https://pubs.usgs.gov/publication/b1836},
  note = {Source identifier: b1836}
}