Since the Business History Review's special issue on Latin America twenty years ago, many articles and monographs have been published utilizing archival sources. An examination of many of these studies and experience in archives suggest that the historian of Latin American business must use a variety of sources to study individual firms and the relationships between business and the national societies in which they operate. In this essay Professor Reber discusses eight types of archives found in the United States, Latin America, Great Britain, France, and Spain which hold manuscripts of interest to those studying both the economic and business history of Latin America. She also offers advice about bibliographic aids, guides, and, briefly, printed primary source materials useful in supplementing the often hard-to-find archival data.