Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910, The North River Tunnels. Paper No. 1155Note B — River Tunnels. (continued 2)Reading editionExcavating ahead of shield.◇Copy noteReturn to River Tunnels. (continued 2)Return to River Tunnels. (continued 2)Return to River Tunnels. (continued 2)Return to River Tunnels. (continued 2)Return to River Tunnels. (continued 2)