Federal Highway Administration (October 1, 2012). National Highway System: Ohio(PDF) (Map). 1:3,015,936. Washington, DC: Federal Highway Administration. Retrieved December 15, 2013.
Federal Highway Administration (October 1, 2012). National Highway System: West Virginia(PDF) (Map). 1:8,448,000. Washington, DC: Federal Highway Administration. Retrieved December 15, 2013.
Ruegsegger, L. Rick; Lefchik, Thomas E. (July–August 1999). "Managing Car-Crunching Sinkholes". Public Roads. 63 (1). Federal Highway Administration. ISSN0033-3735. Archived from the original on October 14, 2021. Retrieved February 2, 2011.
"Machinery Ready to Roll". The Daily Times. Portsmouth, Ohio. Associated Press. September 15, 1981. p. 11. ISSN8750-6963. Retrieved January 25, 2011 – via Google News.
Ohio Rail Development Commission (June 2012). 2012 Official Ohio Rail Transportation Map (Map). 1:570,240. Columbus: Ohio Rail Development Commission. § Q8. Retrieved December 15, 2013.
Office of Technical Services (2012). Traffic Survey Report: Belmont County(PDF). Ohio Department of Transportation. pp. 4–5. Retrieved December 15, 2013.
Ohio Department of Transportation (1975). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. § O10. OCLC5673562. Retrieved January 25, 2011.
Ohio Department of Transportation (1976). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. § O10. OCLC5673562, 13655720, 35168139. Retrieved January 25, 2011.
Ohio Department of Transportation (1983). Ohio Transportation Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Transportation. § O10. OCLC5673562, 13619272. Retrieved January 25, 2011.
Ruegsegger, L. Rick; Lefchik, Thomas E. (July–August 1999). "Managing Car-Crunching Sinkholes". Public Roads. 63 (1). Federal Highway Administration. ISSN0033-3735. Archived from the original on October 14, 2021. Retrieved February 2, 2011.
Ohio Department of Transportation (1975). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. § O10. OCLC5673562. Retrieved January 25, 2011.
"Machinery Ready to Roll". The Daily Times. Portsmouth, Ohio. Associated Press. September 15, 1981. p. 11. ISSN8750-6963. Retrieved January 25, 2011 – via Google News.
Ruegsegger, L. Rick; Lefchik, Thomas E. (July–August 1999). "Managing Car-Crunching Sinkholes". Public Roads. 63 (1). Federal Highway Administration. ISSN0033-3735. Archived from the original on October 14, 2021. Retrieved February 2, 2011.
Ohio Department of Transportation (1976). Ohio Transportation Map(PDF) (Map). 1:554,400. Columbus: Ohio Department of Transportation. § O10. OCLC5673562, 13655720, 35168139. Retrieved January 25, 2011.
Ohio Department of Transportation (1983). Ohio Transportation Map(PDF) (Map). c. 1:563,200. Columbus: Ohio Department of Transportation. § O10. OCLC5673562, 13619272. Retrieved January 25, 2011.