Chapter 23. National Wilderness Preservation System 16 U.S. Code §1131. National Wilderness Preservation System 16 U.S. Code §1132. Extent of System 16 U.S. Code §1133. Use of wilderness areas 16 U.S. Code §1134. State and private lands within wilderness areas 16 U.S. Code §1135. Gifts, bequests, and contributions 16 U.S. Code §1136. Annual reports to Congress