1. Distribution of dentists in the United States by region and state: 1987; 1991; 1995,1989
2. Distribution of endodontists: 1982–1991;Waldman;J Endodon,1994
3. Statistical Abstract of the United States: 1988;Bureau of the Census,1988
4. Population projections for states, by age. Sex, race, and Hispanic origin: 1993 to 2020. Current population reports: Series P-25, no. 1111;Bureau of the Census,1994
5. American Dental Association. Survey Center. American Dental Association. Personal communication, September 1994.