across top reverse: Grid Twenty two, 4/10/70, Downing.
(Osuna Gallery, Washington); purchased April 1979 by Mr. and Mrs. George T. Frampton, Jr., Washington; gift 1981 to the Corcoran Gallery of Art, Washington; acquired 2015 by the National Gallery of Art.
- Washington Color and Light, Corcoran Gallery of Art, Washington, 2010-2011, no catalogue.
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