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• Kweller, E.; Palla, R. L.
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  Test Method and Calculation Procedure for Determining Annual Efficiency for Vented Household Heaters and Furnaces Equipped With Modulating-Type Thermostat Controls.
  National Bureau of Standards, Washington, DC
  NBSIR 82-2497
  Department of Energy, Washington, DC, NBSIR 82-2497
  May 1982