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	Un Traga-aldaba (One "Traga-aldaba"), 1971 Copper plate etching, engraving, aquatint, and drypoint on paper, sheet 19 3/4 x 27 3/4 inches (50.2 x 70.5 centimeters), copper plate 12 5/8 x 19 3/8 inches (32.1 x 49.2 centimeters)