Columbia subject headings:
Harvard subject headings:
Church representation--Manuscripts--History--To 1500--Congresses.
Color in visual communication--History--To 1500--Congresses.
Ecclesiastical law--Manuscripts--History--To 1500--Congresses.
Manuscripts, Latin (Medieval and modern)--Congresses.
Manuscripts, Medieval--Congresses.
Visual communication--History--To 1500--Congresses.
Princeton subject headings:
Communication--History--To 1500.