Columbia subject headings:
Book industries and trade--History--Congresses.
Books--History--1450-1600--Congresses.
Libraries--History--1400-1600--Congresses.
Libraries--History--17th century--Congresses.
Luther, Martin, 1483-1546--Congresses.
Reformation--Congresses.
Harvard subject headings:
Book industries and trade--History--Congresses.
Books--History--1450-1600--Congresses.
Libraries--History--1400-1600--Congresses.
Libraries--History--17th century
Libraries--History--17th century--Congresses.
Libraries--History--18th century--Congresses.
Luther, Martin, 1483-1546--Congresses.
Reformation--Congresses
Princeton subject headings:
Book industries and trade--Europe--History--Congresses.
Books--History--Congresses.
Booksellers and bookselling--Europe--Congresses.
Libraries--History--Congresses.