@misc{indiciaedd3a22afd7d9,
  title = {Problematica Silurica : Systême Silurien du centre de la Bohême — Illustration, Plate 12},
  year = {1908},
  url = {https://www.biodiversitylibrary.org/page/14881022},
  note = {Source identifier: page-14881022}
}