The purpose of this study was to survey and evaluate past and current participation in the Pacific Northwest Bibliographic Center (PNBC) by Oregon libraries. Summarized, the findings were: (1) the PNBC has become a major source of assistance in the flow of interlibrary loans and bibliographic data; (2) it is part of a variety of formal and informal networks not only in the Pacific Northwest, but also linked to numerous other agencies across the United States and Canada; (3) the greatest percentage of PNBC's member libraries are academic libraries; and (4) approximately one-fourth of all requests channeled through PNBC are for materials not held anywhere in the region. This study specifically discusses the services of the PNBC and the Oregon membership in the PNBC. (Appended are tabulated results of a PNBC Opinionnaire.) (Author/NH)