Kollwitz’s In Memoriam Karl Liebknecht
Kathe Kollwitz, Memorial Sheet of Karl Liebknecht (Gedenkblatt fur Karl Liebknecht), 1919-1920, Woodcut heightened with white and black ink, 37.1 × 51.9 cm. Art Institute of Chicago.
khan academy article
Kathe Kollwitz, In Memoriam Karl Liebknecht