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Heating, Ventilating, Air Conditioning, and Refrigeration by Billy C. Langley Fundamentals of Refrigeration by Billy C. Langley Major Appliances by Billy C. Langley Refrigeration and Air Conditioning by Billy C. Langley Electric controls for refrigeration and air conditioning by Billy C. Langley Refrigerant Management by Billy C. Langley Boiler Operations by Billy C. Langley Plant Maintenance by Billy C. Langley Estimating Air Conditioning Systems by Billy C. Langley Fundamentals of Air Conditioning Systems by Billy C. Langley


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