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by G. W. Prescott
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Underwater and floating-leaved plants of the United States and Canada
Neil Hotchkiss
Chrysophyte blooms in the plankton and neuston of marine and freshwater systems
Ontario. Water Resources Branch.
The identification of common water weeds
Richard John Chancellor
Common marsh, underwater, and floating-leaved plants of the United States and Canada
Wetland and riparian plants in Great Britain
Margaret Palmer
Rivers and Ponds (Tracker Nature Guide S.)
Paul Sterry
A manual of aquatic plants
Fassett, Norman Carter