Crater Island
Island in Greene County, Illinois · on the USGS Kampsville quadrangle
39.26171, -90.60762
Maps that show Crater Island
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Kampsville, IL
USGS topo, 2024

Pearl, IL
USGS historical 15-minute topo (1930)

Pearl, IL
USGS historical 15-minute topo (1950)

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
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).