Historic (36)
North American Auto Trails
- Catalog of auto trails from the United States and Canada in the 1910s and 1920s; includes route markers and current numbers. - http://www.marion.ohio-state.edu/fac/schul/trails/trails.html Highway History
- United States Federal Highway Administration page with a collection of various auto trail, U.S. highway, and Interstates histories, some from older FHWA publications, as well as other related information. - http://www.fhwa.dot.gov/infrastructure/history.htm
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