OF THE PRINCIPLES AND PRACTICE OF ROAD-MAKING: COMPRISING THE LOCATION, CONSTRUCTION, AND IMPROVEMENT OF ROADS, (COMMON, MACADAM, PAVED, PLANK, ETC.) AND RAIL-ROADS. BY W. M. GILLESPIE, A. M., C. E. PROFESSOR OF CIVIL ENGINEERING IN UNION COLLEGE. FIFTH EDITION, WITH ADDITIONS. Every Judicious improvement in the establishment of ROADS and bridges NEW YORK PUBLISHED BY A. S. BARNES & CO. 51 JOHN-STREET. |