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| I. M. Pei. Early conceptual sketch for building profile with Capitol, National Gallery of Art East Building, fall 1968. Pen on back of receipt |
| Copyright © National Gallery of Art, Washington D.C. |
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| I. M. Pei. Early conceptual sketch for building profile with Capitol, National Gallery of Art East Building, fall 1968. Pen on back of receipt |
| Copyright © National Gallery of Art, Washington D.C. |