Columbia subject headings:
Harbors--Mediterranean Sea.
Mediterranean Sea--Antiquities.
Shipwrecks--Mediterranean Sea.
Underwater archaeology--Mediterranean Sea.
Harvard subject headings:
Harbors--Mediterranean Sea.
Mediterranean Sea--Antiquities.
Shipwrecks--Mediterranean Sea.
Underwater archaeology--Mediterranean Sea.
Princeton subject headings:
Harbors--Mediterranean Sea.
Mediterranean Sea--Antiquities.
Shipwrecks--Mediterranean Sea.
Underwater archaeology--Mediterranean Sea.