Columbia subject headings:
Black Sea--Commerce.
Black Sea--Description and travel.
Middle East--Commerce.
Middle East--Description and travel.
Harvard subject headings:
Black Sea Region--Description and travel.
Black Sea--Commerce.
Black Sea--Description and travel.
Commercial geography.
Egypt--Description and travel.
Middle East--Commerce.
Middle East--Description and travel.
Turkey--Description and travel.
Princeton subject headings:
Black Sea--Commerce.
Black Sea--Description and travel.
Middle East--Commerce.
Middle East--Description and travel.