Columbia subject headings:
Egypt--Commerce--History.
Egypt--Economic conditions.
Syria--Commerce--History.
Syria--Economic conditions.
Harvard subject headings:
Egypt--Commerce--History.
Egypt--Economic conditions--History.
Syria--Commerce--History.
Syria--Economic conditions--History.
Princeton subject headings:
Egypt--Commerce--History.
Egypt--Economic conditions--History.
Syria--Commerce--History.
Syria--Economic conditions--History.