This report presents data compiled from the 117 libraries that were members of the Association of Research Libraries (ARL) during the 1982/83 academic year, as well as an examination of data for trends in expenditures for the previous 15 years from the 75 academic libraries that were members throughout those years. Information includes data from four libraries that joined ARL in 1982-83: Delaware, Georgia Institute of Technology, and North Carolina State, and the non-university Canada Institute for Scientific and Technical Information. A guide to library code numbers provides a complete list of ARL members. 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; 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 is included. (LMM)