Robert Smithson, Enantiomorphic Chambers, Drawing Y, 1965, Pencil and colored pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37525

Robert Smithson, Enantiomorphic Chambers, Drawing Z, 1965, Pencil and colored pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37532

Robert Smithson, [Untitled], (c. 1965–67), Pencil on graph paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38433

Robert Smithson, Proposal for a Monument on the Red Sea, 1966, Cut-and-pasted printed paper and pencil on printed paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37300

Robert Smithson, Mirror with Rock Salt (Salt Mine and Museum Proposal), 1968, Pencil, cut-and-pasted gelatin-silver print, and cut-and-pasted paper on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37629

Robert Smithson, Fossil Quarry Mirror (Outdoor and Indoor Proposal), 1968, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37634

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36503

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Crayon on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36504

Robert Smithson, Crossection of Spiraling Jetty, (c. 1970), Felt-tip pen and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38535

Robert Smithson, Spiral Jetty in Red Salt Water, (c. 1970), Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38536

Robert Smithson, Spiraling Jetty, (c. 1970), Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38537

Robert Smithson, Spirals, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38538

Robert Smithson, Untitled (Three Spiral Jetty Drawings), (c. 1970), Pencil on three sheets of graph paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38539

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34849

Robert Smithson, Spiral jetty, 1970, Digital Betacam (PAL): 35 minutes, colour, sound, Queensland Art Gallery and Gallery of Modern Art, Brisbane. https://dartabase.art/cite/qagoma/14816

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34858

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34867

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34874

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34882

Robert Smithson, Sketch for Quarry Project: Texas Overflow, 1970, Felt-tip pen on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36502