Columbia subject headings:
Harvard subject headings:
Defense industries--Germany--Harz Mountains--History--20th century.
Defense industries--Germany--Lower Saxony--History--20th century.
Defense industries--Germany--Thuringia--History--20th century.
Germany--Economic conditions--1918-1945.
Princeton subject headings:
Defense industries--Germany--Harz Mountains--History--20th century.
Defense industries--Germany--Lower Saxony--History--20th century.
Defense industries--Germany--Thuringia--History--20th century.
Germany--Economic conditions--1918-1945.