1. Code of Federal Regulations Title 40 Protection of Environment Part 86--Control of Air Pollutionfrom New Motor Vehicles and New Motor Vehicle Engines: Certification and Test Procedures 1987
2. Demand for Highest Efficiency Heating Equipment Grew in 1987 1988
3. An Assessment of the Natural Gas Resource Base of the United States 1988
4. The Gas Energy Supply Outlook: 1980-2000 1980
5. GAS RESEARCH INSTITUTE DIGEST 10 4: 2 (1987).