| defra.gov.uk | UK DEFRA Pollution Prevention and Control |
| angelfire.com | The Search for Safer and Greener Chemical Solvents in Surface Cleaning |
| state.pa.us | Pennsylvania Department of Transportation Recycling Page |
| fau.edu | Pollution Prevention Coalition |
| p2rx.org | Pollution Prevention Resource Exchange (P2Rx) |
| environmentaldefense.org | EDF's Pollution Prevention Alliance |
| environmental-center.com | Indicators of Pollution Management |
| gc.ca | Canadian Pollution Prevention Information Clearinghouse |
| state.or.us | Oregon Commercial Waste Reduction Clearinghouse |
| cleanup.org | Earth 911 |
United States , Nebraska , Omaha