1. American Gas Association, 1975 Gas Facts; also earlier annual issues.
2. American Society of Heating, Refrigerating, and Air Conditioning Engineers, ASHRAE Standard 90-75: Energy Conservation in New Building Design, August 1975.
3. J. Carlin, personal communication, Department of Energy; D. Rosof, personal communication, Department of Housing and Urban Development, May 1977.
4. Steve Cohn, Fuel Choice and Aggregate Energy Demand in the Commercial Sector, ORNL/CON-27, December 1978.
5. Edison Electric Institute, Statistical Yearbook of the Electric Utility Industry for 1975, No. 76-51, October 1976; also earlier annual issues.