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List of county-designated highways in Michigan - Wikipedia
County highway - Wikipedia
Michigan Highways: County Routes: Intercounty Highways
Numbered highways in the United States - Wikipedia
List of County-Designated Highways in Michigan
List of county-designated highways in Michigan - Wikiwand
Michigan Highways: County-Designated A-2 through C-81
Michigan Highways: County-Designated D-19 through H-15
H-13 (Michigan) - AARoads Wiki
Scenic Highways - Caltrans