Columbia subject headings:
Islamic countries--History, Naval.
Navigation--Religious aspects--Islam--History.
Sailors--Religious life--Islamic countries.
Harvard subject headings:
Islamic countries--History, Naval.
Navigation--Religious aspects--Islam--History.
Sailors--Islamic countries--Religious life.
Princeton subject headings:
Islamic countries--History, Naval.
Navigation--Religious aspects--Islam--History.
Sailors--Islamic countries--Religious life.