This report presents data compiled from the 113 libraries that were members of the Association of Research Libraries (ARL) during the 1981/82 academic year, as well as an examination of trends in ARL university libraries from 1975-76 through 1981-82. It is noted that the most important change in 1982 was the smaller rise in serials expenditure and the concomitant steeper increase in expenditures for other materials. Research library resources, staffing, expenditures, and interlibrary loan activity are covered in the report's data tables. Further report sections include: an analysis of selected variables; an analysis of microform holdings; Ph.D. and enrollment statistics; the ARL Library Index; a summary of rank order tables for ARL university libraries; and the 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 instructions for its use are included. (ESR)