ARTstor is collaborating with the Ex Libris® Group to allow subscribers to search the Digital Library at libraries using the Primo Central Index, a mega-aggregation service of hundreds of millions of scholarly e-resources. Users can currently find ARTstor through discovery services including EBSCO Discovery Service™, Paratext’s 19th Century Masterfile database, and Serials Solutions®’ Summon™ service.  Agreements with more discovery services are on the way.