United States system of highways, adopted for uniform marking by the American Association of State Highway officials, November 11, 1926, with additions and amendments subsequently approved 1950
Library of Congress — Maps

United States system of highways, adopted for uniform marking by the American Association of State Highway officials, November 11, 1926, with additions and amendments subsequently approved 1950

united states. bureau of public roads · 1950

Map
CC0 — Public Domain
Library of Congress — Maps
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