Columbia subject headings:
Architectural photography--Austria.
Austria--Buildings, structures, etc.--Pictorial works.
Castles--Austria--Pictorial works.
Monasteries--Austria--Pictorial works.
Palaces--Austria--Pictorial works.
Harvard subject headings:
Architectural photography--Austria.
Castles--Austria--Pictorial works.
Monasteries--Austria--Pictorial works.
Palaces--Austria--Pictorial works.
Princeton subject headings: