Title Celebrating America's national wilderness preservation system / compiled by the Interagency Wilderness Steering Committee, 50th Anniversary National Wilderness Planning Team, Arthur Carhart National Wilderness Training Center, and the Aldo Leopold Wilderness Research Institute, with data from the U.S. Geological Survey's National Gap Analysis Program and Wilderness.net; and support from the USGS Ecosystem Mission Area ; cartography by GreenInfo Network ; graphic design by Ison Design and GreenInfo Network.