Published on the occasion of an exhibition "Gussgeschichte(n) : das plastische Werk von Käthe Kollwitz in Gips, Stucco, Bronze und Zink", at the Käthe-Kollwitz-Museum Köln. The catalogue exists in hard copy and an online catalogue: www.Kollwitz.de/Forschung/WVZ-Plastik The catalogue reviews all published material and supplies recently discovered information from new sources on all editions and in all respective media & formats. The question of molds (not addressed in previous literature) is examined, establishing how many casts were authorized by the artist and her heirs, and in what materials.