This report presents data compiled from the 118 libraries that were members of the Association of Research Libraries (ARL) during the 1984-85 fiscal year. A guide to library code numbers provides a complete list of ARL members. Data tables describe research library collections, interlibrary loans, expenditures, and staffing in fiscal 1985. Further report sections include: an analysis of selected variables; Ph.D. and enrollment statistics; a summary of rank order tables for ARL university libraries; and rank order tables for volumes in library, volumes added (gross), microform holdings, current serials, professional staff, nonprofessional staff, total staff, materials expenditures, materials and binding expenditures, salaries and wages expenditures, total operating expenditures, total items loaned, total items borrowed, and current serials expenditures. A copy of the ARL statistics questionnaire and footnotes and a listing of ARL statistical publications are included. (KM)