Columbia subject headings:
Church buildings--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--Description and travel.
Istanbul (Turkey)--History.
Mosques--Turkey--Istanbul.
Harvard subject headings:
Church buildings--Turkey--Istanbul.
Istanbul (Turkey)--Buildings, structures, etc.
Istanbul (Turkey)--Description and travel--19th century.
Istanbul (Turkey)--History.
Mosques--Turkey--Istanbul.
Princeton subject headings:
Istanbul (Turkey)--Description and travel--19th century.