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upper left in graphite: 19" x 24 3/4" / Rag; upper center in graphite: one sun II / The Photon Structure; lower right in graphite: 4-2-73 / Rockne Krebs ©


Corcoran Gallery of Art, Washington, DC, 1974; 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. 255, no. 1684.