Columbia subject headings:
Harvard subject headings:
Merchant marine--China--Dalian (Liaoning Sheng) Region--Safety measures.
Navigation--China--Dalian (Liaoning Sheng) Region--Safety measures.
Princeton subject headings:
Merchant marine--China--Dalian (Liaoning Sheng) Region--Safety measures.
Navigation--China--Dalian (Liaoning Sheng) Region--Safety measures.