New York, Marlborough-Gerson Gallery, Robert Motherwell: "Open" Series, 1967-1969 , May-June 1969.
Rome, Marlborough Galleria d'Arte; Galleria Toninelli, Milan and Galleria La Bussola, Turin, Robert Motherwell, October 1969-February 1970.
Boston, Harcus Krakow Gallery, Robert Motherwell , May-June 1980, n.p., no. 3.
New York, Marisa del Re Gallery, Ten American Abstract Masters , May 1981, n.p. (illustrated).
Washington, D.C., B. R. Kornblatt Gallery, Eleven Paintings and Two Sculptures from the Sixties , November-December 1981, n. 7.
Stamford Museum & Nature Center, Abstract Expressionism Lives! , September-November 1982, p. 20 (illustrated).
Chicago, Museum of Contemporary Art Chicago, Three Decades: The Oliver-Hoffmann Collection, December 1988-February 1989, p. 24 (illustrated).
New York, Spanierman Modern, August Gallery Selections, August-September 2010, n.p. (illustrated).