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Robert Delaunay Les Ponts Notre Dame . Les Ponts Notre Dame LoyerPerussaux lithograph posthumous impression titled numbered inscribed 'pour Robert Delaunay' and signed by Sonia Delaunay in pencil and stamped 'Atelier Robert Delaunay' cm bonhams Bonhams Creator Robert Delaunay PDoldauto Images from Bonhams Robert Delaunay