@misc{indiciae5c55a6c54b6d,
  title = {Problematica Silurica : Systême Silurien du centre de la Bohême — Illustration, Figs. 4-5, Page 21},
  year = {1908},
  url = {https://www.biodiversitylibrary.org/page/14880949},
  note = {Source identifier: page-14880949}
}