Table 91.--Net volume of sawtimber trees on timberland by species and diameter class, Western Unit, Maryland, 1999 
  
                                                           (In millions of board feet) 
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                                                   Diameter class (inches at breast height)                                                     
        Species         ______________________________________________________________________________________________       All                 
                             9.0-       11.0-       13.0-       15.0-       17.0-       19.0-       21.0-                  classes         SE   
                            10.9        12.9        14.9        16.9        18.9        20.9        28.9        29.0+                           
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  White/red pine              56.0        34.6         8.1          .0         6.2          .0          .0          .0       104.9        45.2  
  Virginia pine                5.5         5.9          .0         6.2          .0          .0          .0          .0        17.6        45.5  
  Other yellow pines           1.0         1.7         3.5          .0          .0          .0          .0          .0         6.2        71.5  
  Other softwoods              6.3        11.8         9.3         9.6        12.6          .0          .0          .0        49.6        46.0  
                        ___________________________________________________________________________________________________________ 
    Total softwoods           68.8        53.9        21.0        15.8        18.8          .0          .0          .0       178.3        32.7  
                        ___________________________________________________________________________________________________________ 
  Red maple                     .0        58.2       108.3        30.7        29.5        10.3        57.8          .0       294.8        30.6  
  Sugar maple                   .0        48.0        13.4        13.9         5.5          .0        37.3        48.9       167.1        40.6  
  Hickory                       .0        19.3        16.4        21.7         9.3          .0        11.9          .0        78.4        30.6  
  Beech                         .0         6.1          .0          .0          .0          .0          .0          .0         6.1       100.0  
  Yellow-poplar                 .0         8.5        12.2        20.4         4.5         8.6        19.0          .0        73.1        54.5  
  Blackgum                      .0         1.5          .0         9.0          .0          .0          .0          .0        10.5        87.3  
  Ash-walnut-cherry             .0        32.9        28.9        32.5          .0          .0          .0        30.9       125.1        32.7  
  Select white oaks             .0        60.1        95.7        55.0        33.9        29.1        80.9          .0       354.8        22.7  
  Select red oaks               .0        59.1        52.9        38.3        16.1        32.0        14.4        44.4       257.3        30.0  
  Other white oaks              .0        18.4        42.8        41.3        26.7         6.7          .0          .0       136.0        27.5  
  Other red oaks                .0        19.7        48.6        67.3        21.4        28.2        58.7          .0       243.9        31.6  
  Black locust                  .0        10.7        12.9         2.1          .0          .0         6.6          .0        32.2        36.9  
  Other hardwoods               .0        14.9        41.4        11.9        15.8          .0        36.7        30.7       151.4        42.7  
                        ___________________________________________________________________________________________________________ 
    Total hardwoods             .0       357.4       473.3       344.2       162.7       115.0       323.3       154.9     1,930.7        10.6  
                        ___________________________________________________________________________________________________________ 
  All species                 68.8       411.3       494.3       359.9       181.5       115.0       323.3       154.9     2,109.0         9.4  
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  SE                          48.7        11.3        14.1        14.5        26.1        42.2        27.4        46.0         9.4 
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