Andy Warhol, Untitled (Unknown Male), (c. 1957), Ballpoint pen on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34808

Andy Warhol, Untitled (Feet), c. 1958, Ballpoint pen on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34820

Andy Warhol, Unknown Female, (c. 1957), Metallic leaf and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36335

Eduardo Paolozzi, Study for Sculpture, 1950, Watercolor on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35107

Andy Warhol, A Is an Alphabet, 1953, Portfolio of 26 offset lithographs, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/14230

Eduardo Paolozzi, Composition, 1951, Collage of cut and pasted serigraphs, printed in dye, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35116