US lawFederal (United States)RegulationsTitle 43 CFR — Public Lands: InteriorChapter II — BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIORPart 3140 — LEASING IN SPECIAL TAR SAND AREASSubpart 3140 — Conversion of Existing Oil and Gas Leases and Valid Claims Based on Mineral Locations3140.2143 C.F.R. § 3140.21Forms.Last amended: 2024Year: 2026Length: 9 wordsOfficial source Cite as 43 C.F.R. § 3140.21 (2026)No special form is required for a conversion application.Previous43 C.F.R. § 3140.14Next43 C.F.R. § 3140.22