@misc{indiciae1a70ecf0269d,
  title = {Problematica Silurica : Systême Silurien du centre de la Bohême — Illustration, Plate 2},
  year = {1908},
  url = {https://www.biodiversitylibrary.org/page/14880963},
  note = {Source identifier: page-14880963}
}