Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--China--Shaanxi Sheng.
China--Social conditions--1644-1912.
Ecology--China--History.
Environmental protection--China
Shaanxi Sheng (China)--Commerce.
Shaanxi Sheng (China)--Population.
Shaanxi Sheng (China)--Social conditions.
Princeton subject headings:
Agriculture--Economic aspects--China.
China--Social conditions--1644-1912.
Ecology--China--History.
Environmental protection--China.