Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158 - James H. Brace | DigiLibraries.com
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Battling Under the River | Lemelson Center for the Study of Invention and Innovation
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Inspection of the Lehigh Tunnel should create delays Thursday - The Morning Call
History and pictures of the Pennsylvania Turnpike and tunnels
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Bast Colliery Tunnel Pennsylvania Antique Map 1878 - Historic Accents
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Crossing Oceans to Cross Rivers: Trans-Atlantic Knowledge & Capital in Tunnelling History” | History SPOT
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Amazon.com: Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158 eBook: Brace, James H.:
With federal funding dicey, officials explore private investment in cross-Hudson tunnel
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Pennsylvania Turnpike Tunnel Photograph by David Dufresne
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Blue Mountain Tunnel, Pennsylvania Turnpike, Newburg, PA. Picture taken 8/4/2007. | Pennsylvania turnpike, Blue mountain, Places
Slatington, Pennsylvania, U.S.A - October 20, 2020 - Traffic on Interstate 476 South into Lehigh Tunnel overlooking the striking colors of fall foliag Stock Photo - Alamy
Tuscarora Mountain Tunnel - Wikipedia
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Blue Mountain Tunnel - Wikipedia
Pennsylvania Turnpike working with feds in investigation of Lehigh Tunnel death - The Morning Call
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The Entrance To The Allgheny Mountain Tunnel In Pennsylvania Pa Stock Photo - Download Image Now - iStock
Tunnel vision: Abandoned Pa. Turnpike tunnels | PennLive.com
