Subchapter I. Natural Resources

• PART I [§ 611 - § 617] - DEDUCTIONS
• PART II [§ 621 - § 621] - REPEALED]
• PART III [§ 631 - § 632] - SALES AND EXCHANGES
• PART IV [§ 636 - § 636] - MINERAL PRODUCTION PAYMENTS
• PART V [§ 638 - § 638] - CONTINENTAL SHELF AREAS