"Catskill Archive" THE RAILROADS OF THE "OLD NORTHWEST" BEFORE THE CIVIL WAR by FREDERIC L. PAXSON (Volume XVII, Part 1, of the Transactions of the Wisconsin Academy of Sciences, Arts, and Letters), October, 1912
"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)
