Projected in over 164 volumes, the late Walter Strauss began this landmark project in order to illustrate and update the classic, but unillustrated, study of European painter-printmakers by Adam von Bartsch. In addition to the new illustrated volumes published in "The Illustated Bartsch" (called Picture Atlas volumes), new critical information, not in the original edition, is published in the Supplementary and Commentary volumes; not all projected additional commentary volumes have been published to date, authors vary. An essential reference tool, sets may be located in major institutional and art museum reference libraries. ARTstor also offers now some 50,000 images of the "Illustrated Bartsch Collection", via its subscription service on the Internet. These are available to the public through selected academic, reference, and museum libraries. Eventually, ARTstor intends to offer the accompanying texts as well.