Lengths and Levels to Bradshaw's Maps of the Canals Navigable Rivers and Railways in the principal part of England dedicated to Thomas Telford published by Ruff London 1833 (50 pp.) bound with Extracts from the Minutes of Evidence given before the Committee of the Lords on the London and Birmingham Railway Bill, London 1832 (66 pp). In stiff cloth-covered boards size 21.5 by 14 cm. The lengths and levels are taken from a datum of six feet ten inches under the sill of the old dock gates at Liverpool. The intention was to have this information in order to interpret the early Bradshaw maps of railways and canals. With two folding maps in a pocket in the rear endpapers: of a continuation of the Lea Navigation & the River Stort, a continuation of the Grand Junction, and a map of the proposed London & Birmingham Railway with a section of the line by George Stephenson (old tape repair to a fold). Recent blue cloth boards and spine. Text and binding VG condition.