Inscription
along lower edge in graphite: R. Mangold / Two Triangles within a Square #2 / 1975
Provenance
Dorothy and Herbert Vogel, New York; gift to NGA, 2010
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along lower edge in graphite: R. Mangold / Two Triangles within a Square #2 / 1975
Dorothy and Herbert Vogel, New York; gift to NGA, 2010