The sheets cover a line along the Tow Ho (陡河) north from Chushan (竹山) and north-east to Yunyang (鄖陽), then south-east down the Han river (漢江) to Kunchow (均州) and Sankwatien (三官殿).Sheet 11 includes an inset plan of Yunyang, scale 1:15,840.Sheet 12 has a small attached tracing-paper extension. The...