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. 2018. The Appalachian region, http://www.arc.gov/appalachian_region/TheAppalachianRegion.asp (19January2018).
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. 2019. Status of the Appalachian Development Highway System: As of September 30, 2019, https://www.arc.gov/images/programs/transp/ADHSStatusReportFY2019.pdf (6March2020).