Mitchell, S. Augustus, (Samuel Augustus), Jr, and Jr (Samuel Augustus) S. Augustus Mitchell. "County map of Boone, McHenry, Lake, De Kalb, Kane, Du Page, Cook, Kendall, Grundy, Will, and Kankakee." Map. Pennsylvania: S. Augustus Mitchell Jr., 1868. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:3f463385p (accessed March 28, 2024).