Original classroom trade vintage catalog for JOHNS-MANVILLE. Manufacturers of Colorlith classroom chalkboards, made of asbestos. J-M Colorlith for chalkboards is a strong, dense sheet that provides the hard, smooth writing surface and light reflectance requirements of high quality boards. It is a combination of cement and asbestos fibers integrally mixed with selected pigments. Chalkboards with metal trim, wood trim, without trims, prefinished, system for partition, conventional wardrobes, curtain panel, free-standing partition, easel-reversible units, projection screen are illustrated. Architectural specifications, installation hints are provided. This unique 1964 old sixteen page architectural brochure would make a marvelous addition to your retro engineering library. Pages are loose and contains a small amount of residual glue on edge.