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Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
Folsom (Map). 1:62500. United States Geological Survey. 1941. Archived from the original on January 9, 2009. (road data updated later, since it shows the completed bypass)
California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original(XLS file) on September 5, 2015. Retrieved June 30, 2015.
Folsom (Map). 1:62500. United States Geological Survey. 1941. Archived from the original on January 9, 2009. (road data updated later, since it shows the completed bypass)