Columbia subject headings:
Publishers and publishing--Poland--Wrocław--History--Congresses.
Harvard subject headings:
Publishers and publishing--Germany--History--Congresses.
Publishers and publishing--Poland--Wrocław--History--19th century--Congresses.
Publishers and publishing--Poland--Wrocław--History--20th century--Congresses.
Wrocław (Poland)--Intellectual life--19th century.
Wrocław (Poland)--Intellectual life--20th century.
Princeton subject headings:
Publishers and publishing--Germany--Breslau--History--Congresses.