Columbia subject headings:
Harvard subject headings:
Agriculture--History--China--Manchuria.
Koreans--China--Manchuria--History
Manchuria(China)--Economic conditions--20th century.
Princeton subject headings:
Agriculture and state--China--Manchuria--History.
Koreans--Agriculture--China--Manchuria--History.
Manchuria (China)--Economic conditions--20th century.
Rice--China--Manchuria--History.