Pittsburgh: A. & B. Smith, ca. 1955. "A. & B. Smith Art-Sign-Process No. 55", "Nu-Film and Blufilm", "Artists Materials Catalog 38". Softcover 8vo's, all illustrated in black and white. Handsome art materials catalogs and a how-to on hte nu-film silscreening process, with two swatched of the material at the rear.