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Bruderheim, a detonating bolide, fell at 1:06 a.m., MST, on March 4, 1960. The fireball traveled on an azimuth of N 100°, at a slope of 40°, with an initial atmospheric velocity of 8 to 10 miles per second. More than 300 kilograms have been recovered from the fall area, a well-defined ellipse centered about latitude 53°54′N, longitude 112°53′W. This ellipse is 312 miles long and 214 miles wide (5.6 by 3.6 km), with its long axis N80W and the larger individuals located near its southeast apex.
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Baadsgaard et al. (1961) studied this question.
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