Know your data sources.

North Dakota Department of Trust Lands. AGOL Feature Services from owner jstegmiller@nd.gov_NDDTL; no auth. - searchOilGasLeases (~33K mineral tracts; 8.9K active) ⭐ filter county, lessee, eligible (default Leased) - getExpiringLeases ⭐ acquisition signal — leases expiring within windowDays - searchSurfaceLeases (~4.9K grazing/ag), getLeaseDetail, getServiceInfo upstream quirks: NDDTL does NOT publish OG-leases as a separate layer; they live inside the unified TrustLandsMineralsVW (filter lease LIKE '%OG-%'). exp/effective stored as MM/DD/YYYY string with " " for null. Counties Title-Case (different from ND DMR's UPPERCASE). landtrustdash.nd.gov is offline — AGOL views are the working public surface.