Public Roads | U.S.... bookstore.gpo.gov

History | FHWA highways.dot.gov

Federal Highway... en.wikipedia.org

United States system of... www.loc.gov

File:Interstate Highway... commons.wikimedia.org

Timeline - Contributions... www.fhwa.dot.gov

Federal Highway Policy... enotrans.org

Timeline - Contributions... www.fhwa.dot.gov

Federal Aid Road Act of... highways.dot.gov

National System of... guides.loc.gov

A Peaceful Campaign of... highways.dot.gov

United States Department of... en.wikipedia.org

National System of... guides.loc.gov

Timeline - Contributions... www.fhwa.dot.gov

Recommended reading for... www.stephenhprovost.com

Updated Federal Road... www.theurbanist.org

Study Calls US... www.motherjones.com

Federal Aid Road Act of... highways.dot.gov

USDOT reveals action place... www.rubbernews.com

Dwight D. Eisenhower and... www.army.mil