The purpose of this study is to explore the public library program of publicizing and interpreting the professional collections and services available for use by professional staffs of welfare agencies and to relate such programs of interpretation to levels of use by the agencies' staffs. Four libraries in cities of over 300,000 population were included in this study. Family welfare agencies were chosen as being representative of welfare agencies in general, and seven such agencies, located in the same cities as the four libraries, were selected for inclusion. The library data were gathered by 25 personal interviews, and the family welfare agency data were gathered from 398 responses to questionnaires. In addition to the interviews, data were gathered from the libraries by examining book lists, bibliographies, film lists, conference programs and library publications. The hypothesis that there is a correlation between the library's program of interpreting its services and the use of the library by welfare agency personnel is partially supported by the findings of this study. (MF)