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SOUTHERN BOUNDARY OF THE UNITED STATES                  MILES
 
Texas (along the Rio Grande, approximate)_____________  1241
 
New Mexico____________________________________________   179.5
 
Arizona (19.1 miles along the Colorado River)_________   372.5
 
California____________________________________________   140.4
                                                        ______
                                                TOTAL   1933.4  Miles
 
Source: Boundaries of the United States and the Several States
        Geological Survey professional paper 909: 1976
        Page #23.