@misc{indiciaeb68e1ed54824,
  title = {How to know the fresh-water algae; an illustrated key for identifying the more common fresh-water algae to genus, with hundreds of species named pictured and with numerous aids for their study — Illustration, BHL page 4597237},
  year = {1954},
  url = {https://www.biodiversitylibrary.org/page/4597237},
  note = {Source identifier: page-4597237}
}