Know your data sources.

Alaska Division of Geological & Geophysical Surveys — state geological survey. Mineral occurrences, geologic-map publication index, mining districts, volcanoes, radon observations. - searchMineralOccurrences ⭐ ~335 — DDS-18 MIL1, filter commodity / group / deposit type / status - searchGeologicMaps ⭐ ~4.16K USGS+DGGS publication index, filter agency / scale / keyword - searchMineralDistricts ⭐ 75 polygons across 14 regions - searchVolcanoes (~53 AVO inventory), getServiceInfo §0 spec drift: geology/statemap_projects + geophysics/Geophysical_Surveys services 500 ("No Layer or Table"). DROPPED. Volcanoes service rejects outFields=* with gateway error — handler enumerates explicit fields. Native CRS varies; outSR=4326 on every call.

Polish Geological Institute (PGI-PIB) Central Geological Database (CBDG) public ArcGIS REST services covering Poland's upstream oil, gas, and coalbed-methane sector. Search hydrocarbon exploration and production concessions (operator/capital group, mineral, concession type, decision date), coal and coal-mine-methane concessions, 2D and 3D seismic survey footprints (contractor, owner, year), hydrocarbon surface seeps, and Upper Silesian Coal Basin boreholes (depth, stratigraphy). Competitive intelligence on operators such as Orlen S.A., seismic-coverage screening, and CBM/coal-mine-methane prospecting. Toggle on and use - no setup needed.

TxGIO — Texas Geographic Information Office (formerly TNRIS), the state GIS clearinghouse, through public ArcGIS REST services. Runs on PatchOps' shared ArcGIS engine and returns WGS84 GeoJSON for incorporated cities, legislative districts, 1:250k geology, NHD hydrography, and StratMap parcel polygons. The parcel MapServer is exposed through bounded service-level identify queries with typed filters and truncation disclosure. Complements rrc, tceq, twdb, and tx-glo. No auth.