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Adding to Subtract, 1974, Ink on grid paper, 59.5 x 79.5 cm,
Adding to Subtract, 1969-70, Ink on grid paper, 45 x 58 cm ,
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Adding to Subtract, 1974, Ink on grid paper, 59.5 x 79.5 cm,
Adding to Subtract, 1969-70, Ink on grid paper, 45 x 58 cm ,