Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910, The Cross-Town Tunnels. Paper No. 1158Note D — THE NEW YORK TUNNEL EXTENSION OF THE PENNSYLVANIA RAILROAD. THE CROSS-TOWN TUNNELS.[A]Reading editionOf the paper by Mr. Noble.◇Copy noteReturn to THE NEW YORK TUNNEL EXTENSION OF THE PENNSYLVANIA RAILROAD. THE CROSS-TOWN TUNNELS.[A]