Columbia subject headings:
Harvard subject headings:
China--Social conditions--20th century.
Environmental sociology--China--History--20th century.
Nature conservation--China--History--20th century.
Social change--China--History--20th century.
Princeton subject headings:
China--Social conditions--20th century.
Environmental sociology--China--History--20th century.
Nature conservation--China--History--20th century.
Social change--China--History--20th century.