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Butler
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Littlewood
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D000389:Air Conditioning / Q000592:standards*; D017402:Chlorofluorocarbons; D003246:Conservation of Energy Resources; D005062:European Union; D005069:Evaluation Studies as Topic; D008284:Maintenance and Engineering, Hospital / Q000592:standards; D012034:Refrigeration / Q000592:standards*; D006113:United Kingdom