Paper and wood products are used in many different applications both at home and at work. For example, in the United States paper is used to publish more than 2 billion books, 350 million magazines, and 24 billion newspapers annually. The pulp and paper industry breaks paper and paperboard production into three major areas: paper grades (SIC 262), paperboard grades (SIC 263), and converted paper and board products (SICs 265 and 267). The first two categories produce primary products in large mills, while the converted products sector produces finished products from primary paper and paperboard materials in smaller, independent manufacturing facilities. Lumber and wood products include a wide range of products, including cut timber; rough wood products, such as hewn posts; lumber and flooring; millwork, such as moldings and cornices; cabinets; plywood; containers; and wood buildings. [Miller Freeman 1998]