Last December the Manuscripts Department of Baker Library issued a new edition of its collections guide entitled, Manuscripts in Baker Library, A Guide to Sources for Business, Economic and Social History. Although this is the fourth edition of its List of Business Manuscripts, the changed title reflects what is felt to be the broadened scope of the collections and their more varied use. Earlier editions appeared in 1932 (minus an index), 1951, and 1969. As before, the new volume is a complete listing of holdings, not just a supplement covering additions since 1969. Even with a few removals, additions come to an even 100 collections, for a total of 1403, as compared with 1303 in the previous edition.