Columbia subject headings:
Harvard subject headings:
Germany--Armed Forces--Equipment--History--20th century.
Military weapons--Germany--History--20th century.
Ordnance--Manufacture
World War, 1939-1945--Equipment and supplies.
Princeton subject headings:
Germany--Armed Forces--Equipment--History--20th century.
Military weapons--Germany--History--20th century.
Underground factories--Germany--History--20th century.
World War, 1939-1945--Germany--Equipment and supplies.