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upper left in red colored pencil over graphite: "Aleph²"; upper left in graphite: (squared); upper right in graphite (vertically): Gallery 65 Corcoran Scale 1/2"=1'; lower right in graphite: R Krebs / 4/69


the artist, Washington, DC; 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. 254, no. 1683.