0 Wessman, CA Archer, S. Johnson, LC Asner, GP 2004 Woodland expansion in US grasslands: assessing land-cover change and biogeochemical impacts G. Gutman, AC Janetos, CO Justice, EF Moran, JF Mustard, RR Rindfuss, D. Skole, BL Turner, II, and MA Chocharane, editors. Land change science: observing, monitoring and understanding trajectories of change on the Earth 185--205