This primary source comes from the Records of the Bureau of Public Roads.
Full Citation: Comparison of Pioneer Roads and National Highway System; ca. 1952; 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/comparison-pioneer-roads-national-highways, April 28, 2024]