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Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910
The New York Tunnel Extension of the Pennsylvania Railroad.
The East River Tunnels. Paper No. 1159

written by "Brace, James H."
...ddle of January, on the rock berm surrounding the 20 by 50-ft. shaft and about 15 ft. below the surface. Fig. 3, Plate LXIV, shows the cutting edge of the caisson assembled. The excavation of the s... read more