This report presents data, describing mostly on-site institutional resources, from the 118 U.S. and Canadian research libraries that were members of the Association of Research Libraries (ARL) during the 1986-87 fiscal year. The following information is included in the document: (1) ARL library data tables reflecting data on collections, interlibrary loans, personnel, and expenditures of each of the 118 research libraries; (2) an analysis of selected variables which summarizes the basic data in the ARL library data tables; (3) Ph.D., faculty, and enrollment statistics; (4) summary of rank order tables of university libraries; (5) rank order tables of university libraries including such data as volumes in library, current serials, materials expenditures, monographs purchased and expenditures for monographs, total items borrowed and loaned, and professional and nonprofessional staff; (6) the ARL statistics questionnaire, 1986-1987; (7) footnotes to the ARL statistics, 1986-1987; and (8) "library expenditures as percentages of university expenditures" (a supplemental separately-issued four-page special report). (CGD)