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Piedras Blanca’s Butterfly (Mariposa de Piedras Banca), 1978-79 Cast and engraved polyester resin plate embossing and viscosity printing, and zinc plate etching, aquatint, engraving and roulette on paper (printed simultaneously using cutout and stacked felts), artist proof, sheet 29 7/8 x 22 1/4 inches (75.9 x 56.5 centimeters), polyester resin plate (cast in a multiple leaf shape) 20 3/4 x 13 1/2 inches (52.7 x 34.3 centimeters), zinc plate 3 1/4 x 4 1/2 inches (8.3 x 11.4 centimeters)