Columbia subject headings:
Istanbul (Turkey)--Antiquities.
Istanbul (Turkey)--Description and travel.
Turkey--Antiquities.
Harvard subject headings:
Istanbul (Turkey)--Antiquities.
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--Description and travel.
Turkey--Antiquities.
Princeton subject headings:
Istanbul (Turkey)--Antiquities.
Istanbul (Turkey)--Description and travel.
Turkey--Antiquities.