Columbia subject headings:
Harvard subject headings:
China--History--Republic, 1912-1949.
Yan, Xishan, 1883-1960
Yang, Hucheng, 1893-1949.
Zhang, Xueliang, 1898-
Princeton subject headings:
China--History--Republic, 1912-1949.
Yan, Xishan, 1883-1960.
Yang, Hucheng, 1893-1949.
Zhang, Xueliang, 1901-2001.