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United Nations Environment Programme ,  [Manual for the refrigeration and air-conditioning technicians and engineers: post phase-out period of CFCs and beginning of phase-out of HCFCs] ,  Manual for the refrigeration and air-conditioning technicians and engineers: post phase-out period of CFCs and beginning of phase-out of HCFCs

United Nations Environment Programme ,  [Recovery and recycling systems guidelines: phasing out ODS in developing countries, refrigeration sector] ,  Recovery and recycling systems guidelines: phasing out ODS in developing countries, refrigeration sector