Rand McNally Standard Map of Illinois annotated in pencil to show Chicago-St. Louis mail route via Peoria and Springfield, ca. 1926, A0904-00027. Missouri Historical Society Library and Research Center.

Rand McNally Standard Map of Illinois annotated in pencil to show Chicago-St. Louis mail route via Peoria and Springfield, ca. 1926, A0904-00027. Missouri Historical Society Library and Research Center. https://mohistory.mobiusconsortium.org/repositories/2/digital_objects/10481 Accessed November 23, 2024.