Columbia subject headings:
Algae--North Atlantic Ocean--Classification.
Algae--North Atlantic Ocean--Geographical distribution.
Cladophora--Classification.
Cladophora--Geographical distribution.
Harvard subject headings:
Algae--North Atlantic Ocean--Classification.
Algae--North Atlantic Ocean--Geographical distribution.
Cladophora--Classification.
Cladophora--Geographical distribution.
Princeton subject headings:
Algae--North Atlantic Ocean--Classification.
Algae--North Atlantic Ocean--Geographical distribution.
Cladophora--Classification.
Cladophora--Geographical distribution.