Der Gesamtkatalog der Wiegendrucke (English: The Union Catalogue of Incunabula) (abbreviated as GW or GKW) is an ongoing project of the Staatsbibliothek zu Berlin and appears in conjunction with the print edition of the union catalogue of incunabula.
[1] The Gesamtkatalog serves as a bibliography or collection of cradle prints or incunabula.
[4] The Gesamtkatalog der Wiegendrucke is available in part in print and in its entirety—in draft form—via an online database.
Volumes 1-7 of the catalogue were published in Leipzig between 1925 and 1940 by Karl W. Hiersemann; they are now out of print.
[5] Volumes 1-7 also have a second edition, which was printed in 1968; these volumes are reprinted without any changes to the content, however, they do include some improvements due to the additions in printing present at the time of reproduction.