Previous efforts to comprehensively catalog 15th century printing include Georg Wolfgang Panzer's "Annales Typographici ab Artis Inventae Origine ad Annum MD" (1793–97) and Ludwig Hain's "Repertorium Bibliographicum" (1822). Hain's work was later supplemented by Copinger's "Supplement" and Reichling's "Appendices", which would pave the way for the "Gesamtkatalog der Wiegendrucke" (1925). The "Gesamtkatalog der Wiegendrucke" ("GW") was the most comprehensive catalog of incunables to date (and still offers more in-depth information than ISTC), but in recent decades work on the catalog has slowed to such a degree that the goal of cataloging all extant incunables under the "GW"'s system is indefinitely far-off.