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