@misc{indiciaef4ac71e32ee6,
  title = {Problematica Silurica : Systême Silurien du centre de la Bohême — Illustration, Plate 4},
  year = {1908},
  url = {https://www.biodiversitylibrary.org/page/14880971},
  note = {Source identifier: page-14880971}
}