Johannes Theodor Baargeld (Alfred Emanuel Ferdinand Gruenwald), Factory, (1920), Ink and crayon on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33303

Johannes Theodor Baargeld (Alfred Emanuel Ferdinand Gruenwald), Untitled (Beetles), 1920, Ink and pencil on tissue, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35886

Johannes Theodor Baargeld (Alfred Emanuel Ferdinand Gruenwald), The Red King (Le Roi rouge), 1920, Ink on printed wallpaper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35978