Definition of Mineral Estate, Substances, Ownership; Power to Lease, Delay Rentals, Bonus, Royalty Before and After Production, Nature of Royalty; Conveyances of Royalty and Mineral Interests; Conveyances, Partition and Adverse Possession of the Mineral Estate; Surface and Subsurface Trespass; Leases from Owners of Concurrent, Successive or Restricted Interests; Oil and Gas Lease: Nature, Duration, Keeping Alive With Delay Rentals, Operations, Production; Royalty and Other Clauses, Market Value, Proceeds, Proportionate Reduction, Minimum Royalty Division and Transfer Orders; Covenants to Protect, Develop and Administer the Lease; Transfers by the Lessor and Lessee, Subject to An Outstanding Lease, Apportionment and Non-Apportionment, Entirety Clause, Pooling, Contracts to Assign the Lease, Farmouts, Creation of Non-Cost Bearing Interests, Divisibility of Covenants; Various Forms of Conveyances and Oil and Gas Leases.