Columbia subject headings:
Book industries and trade--Europe--History--Congresses.
Books--Europe--History--Congresses.
European literature--History and criticism--Congresses.
Printing--Europe--History--Congresses.
Type and type-founding--Europe--History--Congresses.
Harvard subject headings:
Authors and publishers--Europe--History--Congresses.
Publishers and publishing--Europe--History--Congresses.
Princeton subject headings:
Authors and publishers--Europe--History--Congresses.
Publishers and publishing--Europe--History--Congresses.