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| I. M. Pei & Partners, National Gallery of Art East Building Design Team. Study for space-frame node, 15 March 1971. Pen on tracing paper |
| Copyright © National Gallery of Art, Washington D.C. |
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| I. M. Pei & Partners, National Gallery of Art East Building Design Team. Study for space-frame node, 15 March 1971. Pen on tracing paper |
| Copyright © National Gallery of Art, Washington D.C. |