Table 23.  Weight of Bark and Residue from Primary Wood-Using Mills Used for Fuel by Region, Species Type, and Material Used for Fuel, 1991
          (Thousand Dry Tons)

  Region                     Total Residue                   Bark Residue                  Coarse Material                Fine Materials
                      Total   Softwood   Hardwood    Total   Softwood   Hardwood    Total   Softwood   Hardwood    Total   Softwood   Hardwood

Northeast...........  5,055     1,544      3,511       886       229       657      1,905      840      1,065      2,264       475      1,789
North Central.......  3,544       420      3,124     1,421       258     1,163      1,073       88        985      1,050        74        976
Southeast...........  9,722     7,027      2,695     4,650     3,339     1,311        572      280        292      4,500     3,408      1,092
South Central....... 13,736     8,260      5,476     8,238     5,379     2,859        758      183        575      4,740     2,698      2,042
Great Plains........    108        66         42        56        44        12         35       10         25         17        12          5
Intermountain.......  1,888     1,886         22       885       881         4        229      218         11        774       767          7
Pacific Northwest 
  and Alaska........  7,136     6,919        217     2,966     2,889        77      1,875    1,800         75      2,295     2,230         65
Pacific Southwest 
  and Hawaii........  3,610     3,580         30     1,143     1,133        10      1,157    1,147         10      1,310     1,300         10
  
U.S. Total.......    44,799    29,682     15,117    20,245    14,152     6,093      7,604    4,566      3,038     16,950    10,964      5,986
  
Total Estimated Energy Content........................  743.7 Trillion Btu                                                      

   Source: United States Forest Service, Forest Resource of the United States (GTR-RM-234, 1992).