Original metal trade vintage catalog for RAIL STEEL BAR ASSOCIATION. Main office was located at 228 North La Salle Street, Chicago, IL. Authorized producers of marked and certified reinforcing bars. Standard production methods and specification data are given. There is a process diagram illustrating the slitting of a rail and reduction to finished products. Unbound from a large 1931 engineering catalog, this unique old five page technical specifications brochure would display beautifully matted and framed. A fantastic addition to your retro metal library. Pages are detached and may contain a small amount of residual glue on edge.