Columbia subject headings:
Book industries and trade--Italy--Romagna--History--Congresses.
Harvard subject headings:
Book industries and trade--Italy--Romagna--History--Congresses.
Romagna (Italy)--Intellectual life--Congresses.
Princeton subject headings:
Book industries and trade--Italy--Romagna--History--Congresses.
Books--Italy--Romagna--History--Congresses.
Publishers and publishing--Italy--Romagna--History--Congresses.