Columbia subject headings:
Harvard subject headings:
Naval art and science--History--20th century--Dictionaries.
Naval history, Modern--20th century--Chronology.
Naval history, Modern--20th century--Dictionaries.
Princeton subject headings:
Naval art and science--History--20th century--Encyclopedias.
Submarine warfare--History--20th century--Encyclopedias.
Warships--History--20th century--Encyclopedias.