Columbia subject headings:
Ayasofya Müzesi--Exhibitions.
Fossati, Gaspare, 1809-1883--Exhibitions.
Harvard subject headings:
Architecture, Byzantine--Conservation and restoration--Turkey--Istanbul--Exhibitions.
Ayasofya Müzesi--Exhibitions.
Fossati, Gaspare, 1809-1883--Exhibitions.
Istanbul (Turkey)--Buildings, structures, etc.--Exhibitions.
Princeton subject headings:
Ayasofya Müzesi--Exhibitions.
Fossati, Gaspare, 1809-1883--Exhibitions.