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Mariposa del Coronilla (Butterfly from Coronilla), 1978-79 Cast and engraved polyester resin plate embossing, and zinc plate etching, aquatint, engraving, roulette and viscosity printing on paper (printed simultaneously using cutout and stacked felts), artist proof, sheet 31 x 21 1/8 inches (78.7 x 53.7 centimeters), cast and engraved polyester resin plate (in a multiple leaf shape) 21 x 15 1/8 inches (53.3 x 38.4 centimeters), zinc plate 3 3/8 x 4 5/8 inches (8.6 x 11.7 centimeters)