Isom I Lake
Reservoir in Bryan County, Oklahoma · on the USGS Roberta quadrangle
33.94601, -96.29081
Maps that show Isom I Lake
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Roberta, OK
USGS topo, 2022

Durant, OK
USGS historical 15-minute topo (1958)

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-17 (U.S.)
FAA, 2026-10-29

IFR Enroute High Altitude Chart H-06 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).