The matting and framing of large works of art on paper have long constituted a problem for museum conservators. The standard for oversize mat board is 40x60 inches; any size larger than that causes difficulty in mounting the work. Outlined is a system that was revealed as a possibility during an investigation made into mounting procedures for some outside drawings done by Diego Rivera in the 1930's for his fresco cycle Detroit Industry. Most of the drawings consisted of two or more separate sheets approximately 9x6 feet each. They are of fixed and unfixed black, red, brown chalk and charcoal with graphite underdrawings on heavy wove paper. Finding a method for supporting and protecting these large sheets that would stand up to the rigors of modern conservation requirements was a challenge, met by the Japanese screen mounting technique.