Appendix 3:  
         ________________________________________________________________
         
         Approximate area and proportionate extent of ecoregions at the
         province level in the United States (area given to nearest 100
         square miles and percent to nearest tenth.) 
         
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                                                                Extent
                                                                  in
         Province                             Area               U.S. 
         _________________________________________________________________
                                              Square                     
                                              Miles             Percent
         
          124 Arctic Tundra                    19,100            0.5
          125 Bering Tundra (Northern)         46,900            1.3
          126 Bering Tundra (Southern)         23,600            0.7
         M121 Brooks Range                    101,600            2.8
         M125 Seward Peninsula                 20,600            0.6
         M126 Ahklun Mountains                 16,700            0.5
         M127 Aleutian                         22,200            0.6
         
          131 Yukon Plateaus Tayga             56,100            1.6
          135 Coastal Trough Tayga             15,700            0.4
          139 Upper Yukon Tayga                13,000            0.4
         M131 Yukon Tayga--Meadow              55,000            1.5
         M135 Alaska Range                     61,000            1.7
         M139 Upper Yukon Tayga--Meadow        68,400            1.9
         
          212 Laurentian Mixed Forest         147,300            4.1
         M212 Adirondack-New England           43,600            1.2
         
          221 Eastern Broadleaf Forest                              
              (Oceanic)                       104,500            2.9
          222 Eastern Broadleaf Forest                              
              (Continental)                   270,000            7.5
         M221 Central Appalachian              68,100            1.9
         M222 Ozark                             6,400            0.2
         
          231 Southeastern Mixed Forest       193,000            5.4
          232 Outer Coastal Plain Mixed       173,800            4.8
              Forest
          234 Lower Mississippi Riverine       44,300            1.2
              Forest
         M231 Ouachita                          8,800            0.2
         
          242 Pacific Lowland Mixed Forest     14,900            0.4
         M242 Cascade                          53,400            1.5
         M244 Pacific Coastal Mountains        40,000            1.1
         M245 Pacific Gulf                     23,900            0.7
         
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                                                                Extent
                                                                  in
         Province                             Area               U.S. 
         _________________________________________________________________
                                              Square                     
                                              Miles             Percent
         
          251 Prairie Parkland (Temperate)    218,200            6.1
          255 Prairie Parkland (Subtropical)   80,100            2.2
         
          261 California Coastal Chaparral     10,300            0.3
          262 California Dry Steppe            19,200            0.5
          263 California Coastal Steppe/        4,600            0.1
              Mixed Forest/Redwood Forest
         M261 Sierran                          68,300            1.9
         M262 California Coastal Range         24,900            0.7
         
          311 Great Plains Steppe and Shrub    17,600            0.5
          313 Colorado Plateau Semidesert      75,300            2.1
          315 Southwest Plateau/Plains Dry    160,900            4.5
              Steppe and Shrub
         M313 Arizona-New Mexico Mountains     50,200            1.4
         
          321 Chihuahuan Semidesert            85,200            2.4
          322 American Semidesert/Desert       87,700            2.4
         
          331 Great Plains/Palouse Dry        290,700            8.1
              Steppe
          332 Great Plains Steppe             134,000            3.7
         M331 Southern Rocky Mountain         102,300            2.8
         M332 Middle Rocky Mountain            81,800            2.3
         M333 Northern Rocky Mountain          38,100            1.1
         M334 Black Hills                       3,700            0.1
         
          341 Intermountain Semidesert/Desert 107,100            3.0
          342 Intermountain Semidesert        159,100            4.4
         M341 Nevada-Utah Mountains            43,600            1.2
         
          411 Everglades                        7,800            0.2
         M411 Puerto Rico                       3,700            0.1
         
         M423 Hawaiian Islands                  6,500            0.2
         
              TOTAL SQUARE MILES            3,592,800