Columbia subject headings:
Harbors--Oman--History.
India--Foreign economic relations--Oman.
International trade--History.
Islamic Empire--History.
Merchant marine--Oman--History.
Oman--Foreign economic relations--India.
Harvard subject headings:
Harbors--Oman--History.
India--Foreign economic relations--Oman.
International trade--History
Islamic Empire--History
Merchant marine--Oman--History.
Oman--Foreign economic relations--India.
Princeton subject headings:
Harbors--Oman--History.
India--Foreign economic relations--Oman.
International trade--History.
Islamic Empire--History.
Merchant marine--Oman--History.
Oman--Foreign economic relations--India.