Lee Bontecou, [Untitled], 1960, Charcoal and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34224

Lee Bontecou, [Untitled], 1967, Pencil and felt-tip pen on flocked paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37422

Lee Bontecou, [Untitled], 1970, Colored pencil on black paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35761