Relief shown by hachures. Sir A. Cotton's proposed line [canal] shown in red. Includes inset: The frontiers of Assam, Burmah & China on an enlarged scale [ ca. 1:2,168,000]. From: The Journal of the Royal Geographical Society of London. Vol. 37, (1867), p. 231-39; held in Firestone Library. Call number: G7 .J687 v.37 1867