Scale of diagram 4 ca. 1:5,490. Scale of section 5 ca. 1:550. Scale of section 6 ca. 1:1,210. Scale of sections 7-13 ca. 1:2,740,000. From: Journal of the Royal Geographical Society of London. Vol. 9 (1839), pp. 431-41; held in Firestone Library. Call number: G7 .J687 v.9 1839.