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Verbatim text: John, H. 1916. A revision of the North American species of Potamogeton of the section Coleophylli. Rhodora. 18: 121--138.
Author: John, H.
Year: 1916
Title: A revision of the North American species of Potamogeton of the section Coleophylli
Journal: Rhodora
Volume: 18
Pages: 121–138