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Perkasie Tunnel (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Perkasie Tunnel" in English language version.

refsWebsite
Global rank English rank
1loc.gov
70th place
63rd place

loc.gov

lcweb2.loc.gov

  • Spivey, Justin M. (April 2001). "North Pennsylvania Railroad, Landis Ridge Tunnel" (PDF). Historic American Engineering Record. Washington, D.C.: Library of Congress. p. 1. Retrieved January 30, 2014.