Grassy Knob
Summit in Jackson County, Illinois · on the USGS Wolf Lake quadrangle
37.61393, -89.42953
Maps that show Grassy Knob
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Wolf Lake, IL-MO
Detailed map of terrain, trails and roads
USGS topo, 2024
Alto Pass, IL
Old map for history, not navigation
USGS historical 15-minute topo (1924)
Alto Pass, IL
Old map for history, not navigation
USGS historical 15-minute topo (1947)
Alto Pass, IL
Old map for history, not navigation
USGS historical 15-minute topo (1949)
Mississippi Bluffs District Motor Vehicle Use Map (MVUM)
Forest roads and trails open to vehicles
Shawnee National Forest
Shawnee National Forest
Forest Service forest map
Network to Freedom Brochure Map - National Underground Railroad Network to Freedom Program
National Park Service Maps · National Underground Railroad Network to Freedom Program
U.S. Fish and Wildlife Service Alligator Snapping Turtle Range (2024)
Fish & Wildlife Service Refuge Maps
Continental Glaciation Map - Tule Springs Fossil Beds National Monument
National Park Service Maps · Tule Springs Fossil Beds National Monument
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-16 (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).