Columbia subject headings:
Boats and boating--Europe--History.
Europe--Antiquities.
Excavations (Archaeology)--Europe.
Underwater archaeology.
Harvard subject headings:
Boats and boating--Europe--History.
Europe--Antiquities.
Excavations (Archaeology)--Europe
Underwater archaeology
Underwater archaeology--Europe.
Princeton subject headings:
Europe--Antiquities.
Excavations (Archaeology)--Europe.
Ships, Ancient--Europe--History.
Underwater archaeology.