1. Population estimates and projections. Estimates of the population of the United States, by age, sex, and race: 1976–1978;Bureau of the Census,1979
2. The degree of benefit of belts in reducing injury—an attempt to explain study discrepancies;Campbell;Society of Automotive Engineers, Paper No. 790684,1979
3. Use of the nationwide personal transportation study to calculate exposure;Carsten;HSRI Res. Rev.,1981
4. Highway Statistics 1978;Federal Highway Administration,1978
5. Options for the prevention of motor vehicle crash injury;Haddon;Israel J. Med. Sci.,1980