1. Accident Facts,1979
2. Motorcycle Facts,1977
3. Motorcycle injuries: An increasing traffic problem;Gustilo;Minn Med,1965
4. Impact of Motorcycle Helmet Law Repeal in South Dakota;Contract No. DOT HS-6-01423,1978
5. Impact of Motorcycle Helmet Usage in Colorado;Contract No. DOT HS-6-01429,1978