Columbia subject headings:
Harvard subject headings:
Marine ecology--History--19th century--Congresses.
Marine ecology--History--20th century--Congresses.
Oceanography--History--19th century--Congresses.
Oceanography--History--20th century--Congresses.
Seas--History--19th century--Congresses.
Seas--History--20th century--Congresses.
Princeton subject headings:
Ocean and civilization.