Columbia subject headings:
Cuba--Foreign relations--United States.
Human rights--Cuba.
Refugees--Cuba.
Shipwrecks--Cuba.
Tugboats--Cuba.
United States--Foreign relations--Cuba.
Harvard subject headings:
Cuba--Foreign relations--United States.
Human rights--Cuba
Refugees--Cuba
Shipwrecks--Cuba.
Tugboats--Cuba.
United States--Foreign relations--Cuba.
Princeton subject headings:
Cuba--Foreign relations--United States.
Human rights--Cuba.
Refugees--Cuba.
Shipwrecks--Cuba.
Tugboats--Cuba.
United States--Foreign relations--Cuba.