Session "Waste and Value" - Congress of the Association of American Geographers, April, 13th-18th,2010, Marriott Hotel, Washington D.C. (United States) Session "Waste anf value" - Congress of the Association of American Geographers organisé par l'Association des Géographes Américains du 13 au 18 avril 2010, Marriott Hotel, Washington D.C. (Etats-Unis)