This collection chiefly contains travel diaries and correspondence reflecting the trips of American hydraulic engineering professor James W. Daily (1913-1991) and his wife, Sarah A. Daily (1915-2009), to the People's Republic of China in 1974 and 1979, as well as a visit by Sarah in 1994. Also included are letters from Carr Chia-Chang Liang, a Caltech student in the late 1930s, that chronicle his trip back to and conditions in wartime China in the early 1940s.