Columbia subject headings:
Davidson family.
Society of Friends--China--History.
Society of Friends--Missions--China--History.
Harvard subject headings:
Chinese--Missions
Davidson family.
Missionaries--China--Sichuan Sheng--Biography.
Society of Friends--Missions--China--Sichuan Sheng.
Princeton subject headings:
Society of Friends--China--History.
Society of Friends--Missions--China.