Compost Related Links 

U.S. Compost Council

U.S. Compost Council Seal of Testing Assurance Program

Pennsylvania DEP Compost Information

Professional Recyclers of Pennsylvania (PROP)

Penn State College of Agricultural Sciences Composting News and Information

Using Composts to Improve Turf Performance

Compost Use Guidelines (Cornell Waste Mgt Institute)

Using Organic Nutrient Sources