Columbia subject headings:
Freshwater algae--Measurement.
Freshwater microbiology.
Water quality bioassay.
Harvard subject headings:
Algae.
Algal communities.
Aquatic biology--Technique.
Aquatic biology.
Aquatic ecology.
Diatoms.
Freshwater algae--Measurement.
Freshwater microbiology--Methodology.
Water quality biological assessment--Methodology.
Princeton subject headings: