Recreation Fees: Hearing Before the Committee on Energy and Natural Resources, United States Senate, One Hundred Seventh Congress, Second Session on S. 2473, to Enhance the Recreational Fee Demonstration Program for the National Park Service, and for Other Purposes ; S. 2607, to Authorize the Secretary of the Interior and the Secretary of Agriculture to Collect Recreation Fees on Federal Lands, and for Other Purposes, June 19, 2002