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3. 
Cover image for Energy conservation in buildings: heating, ventilation and insulation
4. 
Cover image for Energy conservation in transport : new engines and flywheels
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Cover image for Energy conservation in industry-combustion, heat recovery and rankine cycle machines
6. 
Cover image for Energy saving in buildings : results of the European communities energy R & D and demonstration programmes (1979-1983)
7. 
Cover image for New ways to save energy