Columbia subject headings:
Harvard subject headings:
Agriculture--China--Baoji (Shaanxi Sheng)--Statistics.
Crop zones--China--Baoji (Shaanxi Sheng)--Statistics.
Princeton subject headings:
Agriculture--China--Baoji (Shaanxi Sheng)--Statistics.
Crop zones--China--Baoji (Shaanxi Sheng)--Statistics.