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Field guide to algae and other “scums” in ponds, lakes, streams and rivers – by
Miriam Steinitz Kannan and Nicole Lenca Northern Kentucky University 

(Video) Learn to Identify Cyanobacteria Blooms – Produced by the 2021 Interstate Technology and Regulatory Council –

Phycokey – University of New Hampshire

Varieties of Algae (with micrographs)