I love the sense of history one gets from looking through old industrial brochures and catalogs. They often contain photos of the factories, the equipment they used and sometimes the folks that worked in them. I always have a nice selection of literature pertaining to the Steel Industry, Machine Shops, Industrial Equipment, Boilers, Material Handling Equipment and items relevant to other Process Industries. Check out my store, Reed's Olio of Fun Stuff, for great literature from the 1930's through the 1960's.