Robbs Mound
Summit in Montgomery County, Illinois · on the USGS Sorento North quadrangle
39.00671, -89.60564
Maps that show Robbs Mound
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Sorento North, IL
USGS topo, 2024
Mount Olive, IL
USGS historical 15-minute topo (1915)
Mount Olive, IL
USGS historical 15-minute topo (1944)
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
U.S. Fish and Wildlife Service Alligator Snapping Turtle Range (2024)
Fish & Wildlife Service Refuge Maps (public domain)
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).