Managing change : sustainable approaches to the conservation of the built environment : 4th Annual US/ICOMOS International Symposium organized by US/ICOMOS, the Graduate Program in... por US/ICOMOS International Symposium (4th : 2001 : Philadelphia, Pa.), Teutonico, Jeanne Marie, Matero, F. G. (Frank G.), International Council on Monuments and Sites. U.S. Committee, University of Pennsylvania. Graduate Program in Historic Preservation, Getty Conservation Institute