Vital and health statistics: Series 10, Data from National Health Survey. 23. Volume of dental visits, United States, July 1963-June 1964, statistics on volume of dental visits by type of dental service, age, sex, residence, geographic region, family income, color, education of head of family, usual activity status, and marital status, based on data collected in household interviews, July 1963 June 1964; [by Alice J. Alderman].