center left reverse: Wm. S. Dutterer / Oct. 1968 "Equal"
Burton G. [1902-1991] and Emily Hall [1908-1987] Tremaine, Madison, Connecticut; gift 1977 to NGA.
- True Dutterer: The Work of William S. Dutterer, American University Museum at the Katzen Arts Center, Washington, D.C., 2007, unnumbered catalogue, repro.
- American Paintings: An Illustrated Catalogue. National Gallery of Art, Washington, 1980: 147, repro.
- American Paintings: An Illustrated Catalogue. National Gallery of Art, Washington, 1992: 163, repro.