1. Global Change Research Program, Environmental Research Laboratory, Environmental Protection Agency, Corvallis, OR 97333
2. Department of Forestry, University of Illinois, Urbana, IL 61801
3. Woods Hole Research Center, Woods Hole, MA 02543
4. Trexler and Associates, Inc., Oak Grove, OR 97267
5. Wisniewski and Associates, Inc., Falls Church, VA 22043