Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910: The New York Tunnel Extension of the Pennsylvania Railroad.; The North River Tunnels. Paper No. 1155 | Digital Library | PAMCET

Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910: The New York Tunnel Extension of the Pennsylvania Railroad.; The North River Tunnels. Paper No. 1155 | Digital Library | PAMCET | PAMCET