Columbia subject headings:
Harvard subject headings:
Wang, Yingxia--Correspondence.
Yu, Dafu, 1896-1945
Yu, Dafu, 1896-1945. Correspondence.
Princeton subject headings:
Wang, Yingxia--Correspondence.
Yu, Dafu, 1896-1945--Biography--Marriage.
Yu, Dafu, 1896-1945. Correspondence.