Columbia subject headings:
German literature--19th century--History and criticism--Congresses.
German literature--20th century--History and criticism--Congresses.
German literature--Germany--Ruhr (Region)--History and criticism--Congresses.
Industrialization in literature--Congresses.
Industries in literature--Congresses.
Ruhr (Germany : Region)--In literature--Congresses.
Working class in literature--Congresses.
Working class writings, German--History and criticism--Congresses.
Harvard subject headings:
Comparative literature--Congresses.
Country life in literature--Congresses.
German literature--Germany--North Rhine-Westphalia--19th century--History and criticism--Congresses.
German literature--Germany--North Rhine-Westphalia--20th century--History and criticism--Congresses.
German literature--Germany--Rhineland--19th century--History and criticism--Congresses.
German literature--Germany--Rhineland--20th century--History and criticism--Congresses.
Work in literature--Congresses.
Working class in literature--Congresses.
Princeton subject headings:
German literature--19th century--History and criticism--Congresses.
German literature--20th century--History and criticism--Congresses.
German literature--Germany--Ruhr (Region)--History and criticism--Congresses.
Industrialization in literature--Congresses.
Industries in literature--Congresses.
Ruhr (Germany : Region)--In literature--Congresses.
Working class in literature--Congresses.
Working class writings, German--History and criticism--Congresses.