Columbia subject headings:
Coastwise shipping--Law and legislation--United States.
Maritime law--United States.
Merchant marine--Government policy--United States.
Shipbuilding industry--Law and legislation--United States.
Harvard subject headings:
Coastwise shipping--Law and legislation--United States
Maritime law--United States.
Merchant marine--Government policy--United States.
Shipbuilding industry--Law and legislation--United States.
Princeton subject headings:
Coastwise shipping--Law and legislation--United States.
Maritime law--United States.
Merchant marine--Government policy--United States.
Shipbuilding industry--Law and legislation--United States.