Columbia subject headings:
Harvard subject headings:
Campbell, James Duncan, 1833-1907--Correspondence.
China--Economic conditions--1644-1912--Sources.
China--History--Guangxu, 1875-1908--Sources.
Hart, Robert, 1835-1911--Correspondence.
Princeton subject headings:
Campbell, James Duncan, 1833-1907--Correspondence.
China. Hai guan zong shui wu si shu--Archives.
Customs administration--China--History--Sources.
Hart, Robert, 1835-1911--Correspondence.