By the great wall;
letters from China;
the selected correspondence of Isabella Riggs Williams, missionary of the American Board to China, 1866-1897; introduction by Arthur H. Smith.
Williams, I. Burgess Riggs. (1909). By the great wall: letters from China. New York: F. H. Revell.
Williams, Isabella Burgess Riggs, 1840-1897. By the Great Wall: Letters From China. New York: F. H. Revell, 1909.
Warning: These citations may not always be complete (especially for serials).