Walnut Hill
Summit in Logan County, Illinois · on the USGS Williamsville quadrangle
39.97752, -89.54642
Maps that show Walnut Hill
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Williamsville, IL
USGS topo, 2024
Springfield, IL
USGS historical 15-minute topo (1907)
Springfield, IL
USGS historical 15-minute topo (1930)
Springfield, IL
USGS historical 15-minute topo (1940)
Network to Freedom Brochure Map - National Underground Railroad Network to Freedom Program
National Park Service Maps (public domain) · National Underground Railroad Network to Freedom Program
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-27 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).