Columbia subject headings:
Book industries and trade--Europe--History--Congresses.
Books and reading--Europe--History--Congresses.
Booksellers and bookselling--Europe--History--Congresses.
Booksellers' catalogs--Europe--History--Congresses.
Harvard subject headings:
Book industries and trade--Europe--History--Congresses.
Books--Europe--History--Congresses.
Booksellers and bookselling--Europe--History--Catalogs--Congresses.
Booksellers' catalogs--Europe--History--Congresses.
Princeton subject headings:
Book industries and trade--Europe--History--Congresses.
Books--Europe--History--Congresses.
Booksellers and bookselling--Europe--History--Catalogs--Congresses.
Booksellers' catalogs--Europe--History--Congresses.