Columbia subject headings:
Communism--Germany--History--Bibliography--Periodicals.
Socialism--Germany--History--Bibliography--Periodicals.
Working class--Germany--History--Bibliography--Periodicals.
Working class--History--Bibliography--Periodicals.
Harvard subject headings:
Communism--Germany--History--Bibliography--Periodicals.
Socialism--Germany--History--Bibliography--Periodicals.
Working class--Germany--History--Bibliography--Periodicals.
Working class--History--Bibliography--Periodicals.
Princeton subject headings:
Communism--Germany--History--Bibliography--Periodicals.
Labor movement--Germany--History--Bibiliography--Periodicals.
Labor movement--History--Bibliography--Periodicals.
Socialism--Germany--History--Bibliography--Periodicals.