Alexander Calder, Portrait of Curt Valentin, 1947 or before, Ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33007

Alexander Calder, [Untitled], 1941, Gouache on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33812

Alexander Calder, Score for Ballet 0-100 from VVV Portfolio, 1942, published 1943, Etching from a portfolio of five etchings (one with aquatint), three duplicated drawings (two watercolor on paper and one crayon on paper), one collage, one engraving, and one gelatin silver print, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/32005