@misc{indiciae47e88f8df414,
  title = {The inorganic constituents of echinoderms},
  author = {F. W. Clarke and W. C. Wheeler},
  year = {1915},
  doi = {10.3133/pp90l},
  url = {https://pubs.usgs.gov/publication/pp90L},
  note = {Source identifier: pp90L}
}