RAILROADS IN NORTH AMERICA; Some Historical Facts and An Introduction to an Electronic Database of North American Railroads and Their Evolution by M. C. Hallberg (April 24, 2006) [1]Archived 2008-05-12 at the Wayback Machine
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RAILROADS IN NORTH AMERICA; Some Historical Facts and An Introduction to an Electronic Database of North American Railroads and Their Evolution by M. C. Hallberg (April 24, 2006) [1]Archived 2008-05-12 at the Wayback Machine