Nikolai Suetin, Study for Composition, 1920, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38358

Nikolai Suetin, [Untitled], (1922–24), Watercolor and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36506