Käthe Kollwitz. Catalogue raisonné of her Prints. Werkverzeichnis der Graphik.
Bern: Kornfeld, 2002. Cloth in dust jacket. 2 vols. in German + CD with English text. 720 pp. with 17 color plates and 385 monochrome illustrations. Vol. 1: Works from 1890-1913. Vol. 2: Works from 1914-1941. Supersedes the previous catalogue raisonné by Klipstein. More