Gertrude Lubby Lake
Reservoir in Nueces County, Texas · on the USGS Concordia quadrangle
27.62115, -97.65623
Maps that show Gertrude Lubby Lake
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Concordia, TX
USGS topo, 2022
Petronila, TX
USGS historical 15-minute topo (1954)
Petronilla, TX
USGS historical 15-minute topo (1924)
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).