From Many, One: The Archival Infrastructure for U.S. Social Science Data Research As data professionals consider the role of data in the emerging infrastructure of "digital libraries," it may be useful to examine the archival institutions in the U.S. that collectively already form the organizational infrastructure for social science data research. This examination provides an opportunity to investigate the unique missions of each of the archival institutions represented, and to consider them as complements to each other. Who is responsible for what? Who serves which researchers? What kinds of social science data does each preserve? What is the relationship between these institutions and the emerging virtual digital libraries? Participants are Janet Vavra, Inter-university Consortium for Political and Social Research; Ilona Einowski, UC Data Archive, focusing on the archiving of state administrative welfare data; Cindy Severt, University of Wisconsin's Data Program Library Service, focusing on the kinds of uniquely-held archival collections at some of the academic data libraries/archives); and Margaret O. Adams, Reference Services Program Manager, Center for Electronic Records.