ASHRAE handbook 1981 fundamentals an instrument of service prepared for the profession containing a technical data section of reference material pertaining to systems for heating, refrigerating, ventilating and air-conditioning and based on ASHRAE transaction- the investigations of the ASHRAE Research Programs and Cooperating Institutions and the practice of the members and friends of the society : complete index to technical sections of all current volumes. (American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1981)