(a) The North American Industry Classification System (NAICS) has replaced the Standard Industrial Classification (SIC) system.

(b) Four components of Biomass are collected: agricultural waste, wood harvested directly from trees, wood residues and byproducts from mill processing, and wood-related and paper-related refuse. The 'Biomass Total' does not include pulping liquor or black liquor.

(c) Agricultural Waste includes bagasse, rice hulls, nut shells, and orchard prunings.

(d) Wood Harvested Directly from Trees includes roundwood, wood chips, and tree bark.

(e) Wood Residues and Byproducts from Mill Processing include sawdust, shavings, and slabs.

(f) Wood-Related and Paper-Related Refuse includes scrap, wastepaper, wood pallets, and packing materials.

  Source: Energy Information Administration, Office of Energy Markets and End Use, Energy Consumption Division, Form EIA-846, '1998 Manufacturing Energy Consumption Survey.'