Columbia subject headings:
Harvard subject headings:
Agriculture--China--Tongchuan (Shaanxi Sheng)--History.
Agriculture--Economic aspects--China--Tongchuan (Shaanxi Sheng)--History.
Tongchuan (Shaanxi Sheng, China)--History.
Princeton subject headings:
Agriculture--China--Tongchuan Shi--History.
Agriculture--Economic aspects--China--Tongchuan Shi--History.
Tongchuan Shi (China)--History.