Pennsylvania Tunnel Plan; contract let May 2, ‘04, to O'Rourke Eng. Con. Co.; work begun in Manhattan shaft April 1, '04, in Weehawken shaft, Sept. 1 ; shields of north tube met 168 ft. west of state line Sept. 12, '06, south tube, 370 ft. east of state line, Oct. 9, ’06.
Digital version published by City University of New York. Graduate School and University Center, Mina Rees Library.
King's Booklets: The Pennsylvania Railroad Tunnels and Terminals in New York City (New York: Moses King, 1904), n.p.
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