Columbia subject headings:
Ningbo Shi (China)--Antiquities.
Salvage--China--Ningbo Shi.
Shipwrecks--China--Ningbo Shi.
Underwater archaeology--China--Ningbo Shi.
Harvard subject headings:
Ningbo Shi (China)--Antiquities.
Salvage--China--Ningbo Shi.
Shipwrecks--China--Ningbo Shi.
Underwater archaeology--China--Ningbo Shi.
Princeton subject headings: