The purpose of this directory is to identify and describe all academic library consortia in the continental United States that satisfy the following specified criteria for inclusion: participating institutions must be autonomous, more than half the members must be academic libraries, two or more libraries must be involved, library consortia must be separate from university consortia with the goal of improving library services, the consortium must be beyond the exploratory stages, and organized so as to benefit the academic participants involved. Each entry, verified by the submitting institution, lists the geographical area served, participants and year joined, purpose and objectives, current activities, conditions of participation, annual budget and source, staffing, advisory boards, publications, headquarters address, and information source. Statistical tables summarize the directory entries by activity, and along dimensions such as age, size, membership, staffing and budget information. Three indexes are provided, to help users locate consortia by name, State or type of activity. A selected bibliography is included. (The Supplement to the directory is LI 004 174. Phases I and II of the preliminary studies are available as ED 057 825 and 057 826.) (Author/SJ)