[American Society of Agricultural and Biological Engineers International Symposium on Air Quality and Waste Management for Agriculture, 16-19 September 2007, Broomfield, Colorado - ()] International Symposium on Air Quality and Waste Management for Agriculture, 16-19 September 2007, Broomfield, Colorado - Characteristics of Broiler Litter Using Different Types of Materials (Straw, Wood Shavings and Rice Hulls). A Castilla y Leon (Spain) Case Study.