World Wilderness Congress (6th : 1998 : Bangalore, India)
Ogden, UT : U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, [1998-2000]
2000
World Wilderness Congress (9th : 2009 : Merida, Mexico), author.
Fort Collins, CO : United States Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2011.
2011
World Wilderness Congress (8th : 2005 : Anchorage, Alaska)
Fort Collins, CO : U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, [2007]
2007