Columbia subject headings:
Art, German--Germany--Cologne--Congresses.
Art, German--Germany--Cologne--Exhibitions.
Art, High Gothic--Germany--Cologne--Congresses.
Art, High Gothic--Germany--Cologne--Exhibitions.
Harvard subject headings:
Art, German--Germany--Cologne--Congresses.
Art, German--Germany--Cologne--Exhibitions.
Art, High Gothic--Germany--Cologne--Congresses.
Art, High Gothic--Germany--Cologne--Exhibitions.
Princeton subject headings:
Art, German--Germany--Cologne--Congresses.
Art, German--Germany--Cologne--Exhibitions.
Art, High Gothic--Germany--Cologne--Congresses.
Art, High Gothic--Germany--Cologne--Exhibitions.