Columbia subject headings:
Harvard subject headings:
Defense industries--China--Hebei Sheng--History--20th century--Sources.
Defense industries--China--Henan Sheng--History--20th century--Sources.
Defense industries--China--Shanxi Sheng--History--20th century--Sources.
Hebei Sheng (China)--Industries--Sources.
Henan Sheng (China)--Industries--Sources.
Shanxi Sheng (China)--Industries--Sources.
Princeton subject headings:
Defense industries--China--Hebei Sheng--History--20th century--Sources.
Defense industries--China--Henan Sheng--History--20th century--Sources.
Defense industries--China--Shanxi Sheng--History--20th century--Sources.
Hebei Sheng (China)--Industries--Sources.
Henan Sheng (China)--Industries--Sources.
Shanxi Sheng (China)--Industries--Sources.