Katz, S. H.. Temperatures in Cabs of Freight Locomotives Passing Through Tunnels of the Chesapeake & Ohio Railroad. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc38377/. Accessed May 23, 2013.
Katz, S. H.. Temperatures in Cabs of Freight Locomotives Passing Through Tunnels of the Chesapeake & Ohio Railroad. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc38377/. Accessed May 23, 2013.
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