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on verso: R Mangold 1975 Two Triangles within a square #2


Dorothy and Herbert Vogel, New York, NY; purchase/gift to NGA, 1991.

Exhibition History
20th Anniversary Exhibition of the Vogel Collection, Brainerd Art Gallery, State University College of Arts and Science, Potsdam, New York; Gallery of Art, University of Northern Iowa, Cedar Rapids, 1982-1983, unpaginated, no cat. nos.
Jenseits des Bildes, Werke von Robert Barry, Sol Lewitt, Robert Mangold, Richard Tuttle, aus der Sammlung Dorothy & Herbert Vogel, New York (Beyond the Picture, Works by..., from the Collection...), Kunsthalle Bielefeld, Germany, 1987, no. 101, 246.
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