Chalk Hill
Summit in San Patricio County, Texas · on the USGS Mathis quadrangle
28.11501, -97.84606
Maps that show Chalk Hill
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Mathis, TX
USGS topo, 2022
Mathis, TX
USGS historical 15-minute topo (1927)
Mathis, TX
USGS historical 15-minute topo (1954)
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-20 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-07 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-21 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).