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Library,Documentation and Information Science Division

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borderland which separates the known from the unknown”

-P.C.Mahalanobis


Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The East River Tunnels. Paper No. 1159


Project Gutenberg Railroad tunnels -- Design and construction Brace, James H.

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