The Estimated Cost of Completing it to Cumberland, and the Prospects of Income to be Derived from the Transportation Upon it of the Coal and Iron of the Mines in Alleghany County; with Estimates of the Comparative Cost of Transporting Coal by the Canal, and by the Baltimore and Ohio Rail-road. Made at the Request of Thomas W. Ward, Esq., Agent for Messrs. Baring, Brothers & Co. by William H. Swift, and Nathan Hale