Columbia subject headings:
Oman--Foreign relations--United States.
Oman--History--19th century.
United States--Foreign relations--Oman.
Harvard subject headings:
Oman--Foreign relations--United States.
Oman--History--19th century.
United States--Foreign relations--Oman.
Princeton subject headings:
Oman--Relations--United States.
United States--Relations--Oman.