It has taken the effort of lots of people to integrate the various aspects of accessibility guidelines and the outdoor environment into one easy-to-use document. The authors gratefully acknowledge the contributions of those who provided advice and photographs:

• Pete Antos-Ketcham, Green Mountain Club of the Appalachian Trail Conservancy
• Peter Axelson, Beneficial Designs, Inc.
• Jim Beard, Forest Service, Southwestern Region, Coconino National Forest
• Larry Blocker, Forest Service, Northern Region
• Cathy Briggs, Forest Service, Southern Region, National Forests in Florida
• Nancy Brunswick, Forest Service, Southwestern Region, Cibola National Forest
• Rory Calhoun, Washington State Interagency Committee for Outdoor Recreation
• Mary Chislock, Forest Service, Pacific Southwest Region, Sequoia National Forest
• Brad Cownover, Bureau of Land Management
• David Dercks, Forest Service, Eastern Region
• Marti Dodds, Forest Service, Southwestern Region, Prescott National Forest.
• Christopher Douwes, Federal Highway Administration
• Chuck Frayer, Forest Service, Pacific Northwest Region
• Mary Gebhart, Forest Service, Eastern Region, White Mountain National Forest
• Jill Gravinck, Northeast Passage, University of New Hampshire
• Peggy Greenwell, United States Access Board
• Bill Hamele, Forest Service, Washington Office
• Chris Hartman, Forest Service, Intermountain Region
• Steve Hennig, Forest Service, Alaska Region
• Bill Hughes, Forest Service, Southern Region
• Thomas Iraci, Forest Service, Pacific Northwest Region
• Peter Jensen, Peter S. Jensen and Associates, LLC
• Thomas Kokx, Thomas Kokx Associates
• Debby Kriegel, Forest Service, Southwestern Region, Coronado National Forest
• Nora Laughlin, Forest Service, Alaska Region
• Patti Longmuir, PEL Consulting
• Teresa Martinez, Appalachian Trail Conservancy, Southwest and Central Virginia
• Holli McClain, Bureau of Land Management
• Jim B. Miller, Forest Service, Washington Office
• Lis Novak, Forest Service, Intermountain Region
• Kim Round, Forest Service, Rocky Mountain Region, San Juan National Forest
• Jane Ruchman, Forest Service, Northern Region, Gallatin National Forest
• Tom Savage, Forest Service, Pacific Northwest Region, Gifford Pinchot National Forest
• Karen Schroyer, Forest Service, Intermountain Region, Wasatch-Cache National Forest
• Jaime Schmidt, Forest Service, Chugach National Forest
• James Schwartz, Forest Service, Washington Office
• Morgan Sommerville, Appalachian Trail Conservancy, North Carolina
• Nancy Snoberger, Forest Service, Southern Region, National Forests of Texas
• Shanay A Stowe, Forest Service, Pacific Southwest Region, Sequoia National Forest
• Jim Thompson, Forest Service, Northern Region
• Brian Vachowski, Forest Service, Missoula Technology & Development Center
• Ramiro Villalvazo, Forest Service, Washington Office
• Thomas E Wright, Forest Service, Southern Region, George Washington and Jefferson National Forest, Dry River Ranger District
• Alan Yamada, Forest Service, San Dimas Technology & Development Center

The authors are indebted to the MTDC publications and support staff who created an attractive and easy-to-read report from our raw material: Ian Grob, Heather Hall, Damien Hoffman, Jim Kautz, Bert Lindler, Sara Lustgraaf, Heather Matusiak, Mary Trankel, and Jerry Taylor Wolf. The authors are particularly grateful for the illustrations produced by Deb Mucci.