Columbia subject headings:
Art, Medieval--Congresses.
Artisans--Economic conditions--Congresses.
Artists--Economic conditions--Congresses.
Harvard subject headings:
Art, Medieval--Congresses
Artisans--Economic conditions--Congresses.
Artists--Economic conditions--Congresses.
Princeton subject headings:
Art, Medieval--Congresses.
Artisans--Economic conditions--Congresses.
Artists--Economic conditions--Congresses.