@misc{indiciaea36e6a3ac1c2,
  title = {Die Süsswasserfauna Deutschlands. Eine Exkursionsfauna — Illustration, Page 7},
  year = {1909},
  url = {https://www.biodiversitylibrary.org/page/1008729},
  note = {Source identifier: page-1008729}
}