Know your data sources.

Colorado State Land Board — ~3M acres state trust lands. Lease + surface ownership + upcoming disposals. - searchOilGasLeases ⭐ Lease_Type='Oil and Gas' filter on ~4.5K leases (991 O&G) - searchUpcomingDisposals ⭐ TRXN-based auction tracts (sparse — 1-5 active) - searchSurfaceOwnership (~6.3K), getLeaseDetail, getServiceInfo upstream quirks: SLB GIS published by martinwi (same org as COGCC_VIEW). Spec said SLB_Leases_ALL_Public — that's the item title, NOT the URL path. Actual: Leases_ALL_2021/FeatureServer/0. Lease_Status: Active (4541), Out for Signature (13). Beneficiary dominated by School (4196). Lease_Subtype has 70+ values + data leaks. CSLB disposals layer 2 only (0/1 return 400).

Utah SITLA — ~3.4M acres of trust lands; strongest state-trust portfolio per acre after TX. - searchOilGasLeases ⭐ ~851 active O&G mineral leases (10 production_status) - searchInactiveLeases ~5.5K historical / expired O&G leases - searchSurfaceOwnership ⭐ ~16K. owner=Fed/Private/State/Tribal; agency=BLM/SITLA/USFS - getLeaseDetail single-lease lookup by leasegis (ML22161.0) upstream quirks: TWO origins — /mapping/rest (UtahSITLA) for Contracts; /server/rest (plpcoadmin_agol) for Ownership. Active O&G is **layer 1 NOT 0** of Contracts_Oil_Gas. class has trailing spaces ('ML '). Active dates are epoch ms; inactive dates are MM/DD/YYYY strings. Active layer has NO county — bbox/near only.

Wyoming OSLI — ~3.5M acres state trust + mineral estate. - searchOilGasLeases (~15.4K — slim schema) - searchSchoolSections ⭐ FundCode='CS' (Common School Sec 16+36 trust ~20K) - searchSurfaceOwnership (~31.6K), searchUpcomingAuctionLands (~195 LARCS rich), getServiceInfo Spec drift: getLeaseDetail DROPPED — lease polygon schema is too slim (LeaseNumber + dates only). LARCS table provides rich county/acres/bidPerAcre attributes — surfaced as searchUpcomingAuctionLands. upstream quirks: StateOwnership has NO County column — bbox/PLSS scoping only. FundCode CS dominates (20.1K of 31.6K parcels). Native gis2.statelands.wyo.gov returns rich schemas; AGOL mirrors are slimmer.