Columbia subject headings:
Harvard subject headings:
Baltic Sea Region--Antiquities.
Shipwrecks--Baltic Sea Region.
Underwater archaeology--Baltic Sea Region.
Princeton subject headings:
Baltic Sea--Antiquities.
Excavations (Archaeology)--Baltic Sea.
Excavations (Archaeology)--Germany, Northern.
Germany, Northern--Antiquities.
Underwater archaeology--Baltic Sea.
Underwater archaeology--Germany, Northern.