This primary source comes from the Records of the Bureau of Public Roads.
Full Citation: Historic Trails of the United States; ca. 1944; Maps - Historic Roads and Trails; Historical Photograph Files, 1896 - 1963; Records of the Bureau of Public Roads, Record Group 30; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/historic-trails-united-states, May 5, 2024]