The development of the telephone dial access service is described, including initial services, procedures, library service, promotion and publicity, evaluation, and experimental programs, as well as arrangements with other states, institutions, and agencies and a study of the feasibility of a national dial access library. The major portion of the report consists of appendices, which include: facts on the service and its operations, a comparison of 1971 and 1979 survey responses, a 1974-75 report on the service, samples of MD self-test materials, a summary of the conclusions of a feasibility study for establishing a national medical dial access information retrieval system, a chart indicating the number of calls by month, and a table indicating the number of calls by health professionals. Three references and a 24-item bibliography are provided. (RBF)