The contractors book ... / H. Gerlach ; J.S. Vernam, mechanical engineer & draughtsman.

Print shows construction of a railroad and a canal in a wilderness area.
Illus. in: The contractors book of working drawings of tools and machines used in constructing canals, rail roads and other works, with bills of timber and iron. Also tables and data for calculating the cost of earth, and other kinds of work / compiled by George Cole. Buffalo, N.Y. : Compton, Gibson & co., 1855, title page.