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	Caja Negra (Black Box), 1982-83 Copper plate mezzotint and engraving on paper with color from aluminum relief plate, artist proof, sheet 29 5/8 x 22 3/4 inches (75.2 x 57.8 centimeters), copper plate 16 1/4 x 12 3/4 inches (41.3 x 32.4 centimeters), aluminum plate 24 x 31 inches (61 x 78.7 centimeters)