Columbia subject headings:
Harvard subject headings:
China--History--Warlord period, 1916-1928--Archival resources.
Generals--China--Correspondence.
Manchuria (China)--History, Military--Archival resources.
Princeton subject headings:
China--History--Warlord period, 1916-1918.
Generals--China--Correspondence.
Manchuria (China)--History, Military--Archival resources.