Columbia subject headings:
Harvard subject headings:
Feed industry--China--History--19th century--Statistics.
Feed industry--China--History--20th century--Statistics.
Flour industry--China--History--19th century--Statistics.
Flour industry--China--History--20th century--Statistics.
Princeton subject headings:
Flour and feed trade--China--History--19th century--Statistics.
Flour and feed trade--China--History--20th century--Statistics.