Columbia subject headings:
Harvard subject headings:
Henrichshütte (Hattingen, Germany)--History--20th century--Exhibitions.
Plant shutdowns--Germany--Hattingen--History--20th century--Exhibitions.
Steel industry and trade--Germany--Hattingen--History--20th century--Exhibitions.
Princeton subject headings:
Henrichshütte (Hattingen, Germany)--History--20th century--Exhibitions.
Plant shutdowns--Germany--Hattingen--History--20th century--Exhibitions.
Steel industry and trade--Germany--Hattingen--History--20th century--Exhibitions.