Delaware State Highway Department; The National Survey Co. (1938). Official Road Map of the State of Delaware(PDF) (Map). Dover: Delaware State Highway Department. Retrieved August 19, 2019.
Delaware State Highway Department (1952). Official Highway Map of Delaware(PDF) (Map) (1952–1953 ed.). Dover: Delaware State Highway Department. Retrieved August 19, 2019.
Delaware State Highway Department (1964). Official Highway Map of Delaware(PDF) (Map). Dover: Delaware State Highway Department.