The national bibliographic services currently provided by the Library of Congress (LC) include the Machine-Readable Cataloging (MARC) service, LC's Automated Process Information File System, and the Library of Congress Subject Headings. Cooperative projects involving LC include COMARC (Cooperative MARC), a national bibliographic data base for book-form material, and CONSER (Conversion of Serials), a national serials data base. The role of LC in the evolving national network is being coordinated by its Network Development Office. Major activities underway in this office include: (1) coordinating and planning with other segments of the library community; (2) various research projects; and (3) exploration into the resources required to make LC on-line services available outside of LC. (PF)