Columbia subject headings:
Architecture, Gothic--Austria--Upper Austria--History--Congresses.
Art, Gothic--Austria--Upper Austria--History--Congresses.
Church architecture--Austria--Upper Austria--History--Congresses.
Upper Austria (Austria)--Buildings, structures, etc.--Congresses.
Harvard subject headings:
Architecture, Gothic--Austria--Upper Austria--Congresses.
Art, Gothic--Austria--Upper Austria--Congresses.
Princeton subject headings: