@misc{indiciae6cbb56cff0ad,
  title = {Problematica Silurica : Systême Silurien du centre de la Bohême — Illustration, Fig. 7, Page 23},
  year = {1908},
  url = {https://www.biodiversitylibrary.org/page/14880951},
  note = {Source identifier: page-14880951}
}