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