lower right in graphite: Sangiamo '66
Robert Scott Wiles, Arlington, Virginia; Corcoran Gallery of Art, Washington, DC, 1981; acquired 2015 by the National Gallery of Art
- Simmons, Linda Crocker and with the assistance of Adrianne J. Humphrey, et al. American Drawings, Watercolors, Pastels, and Collages in the Collection of the Corcoran Gallery of Art. Washington, DC: Corcoran Gallery of Art, 1983: p. 238, no. 1588.