all on mount: upper left verso, in graphite: Set C2 No.5; lower left verso, in graphite: E+1 / Z+1 / Perry / AS+1; by Georgia O'Keeffe, upper left verso, in graphite: 216-E; by later hand, lower right verso, in graphite: 024
Georgia O'Keeffe; gift to NGA, 1949.
- Bry 1958, no. 66.
- Art Institute of Chicago, 1989.
- "Visual Music", The Museum of Contemporary Art, Los Angeles; Hirshhorn Museum and Sculpture Garden, Washington, 2005.