Columbia subject headings:
Harvard subject headings:
Germany--History--Revolution, 1918--Sources.
Offenbach am Main (Germany)--Politics and government--20th century--Sources.
Soldiers--Germany--Offenbach am Main--History--Sources.
Works councils--Germany--Offenbach am Main--History--20th century.
Princeton subject headings:
Cities and towns--Germany--History.
Offenbach am Main (Germany)--History.