Columbia subject headings:
Harvard subject headings:
China--History--Jiaqing, 1796-1820--Sources.
Statesmen--China--Correspondence.
Sun, Erzhun, 1770-1832--Correspondence.
Princeton subject headings:
China--History--Jiaqing, 1796-1820--Sources.
Statesmen--China--Correspondence.
Sun, Erzhun, 1770-1832--Correspondence.