three untitled prints

MICHAEL GOLDBERG; and JOAN MITCHELL three untitled prints three screenprints (two in colors), 1960, on wove papers, the two Goldberg prints signed and dated '61' in pencil, numbered 'special edition 13/19' and 'special edition 15/19', each the full sheet, each with pale time staining, minor surface soiling and a few soft creases at the sheet edges, the Mitchell with the palest offsetting on the reverse (slightly showing through along the right sheet edge), otherwise each in very good condition each S. 18 1/8 x 14 3/8 in. (460 x 365 mm.) and smaller (3)