Griswold's railroad engineers' pocket companion for the field. [electronic resource] Comprising rules for calculating deflexion distances and angles, tangential distances and angles, and all necessary tables for engineers; also, the art of leveling from preliminary survey to the construction of railroads ... By W. Griswold.
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 2000. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation as part of Making of America IV: the American voice, 1850-1877.