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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="342.628" BBK_DIFF="-71.5" BBK_DIFF_Y="648.5"/>
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      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="-539.327" BBK_DIFF="-183.6"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="644.97" BBK_DIFF="115.3"/>
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      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="4214.946" BBK_DIFF="145.3"/>
      <bbk:Obs TIME_PERIOD="1971-04" OBS_VALUE="1718.426" BBK_DIFF="-1.3"/>
      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="1741.307" BBK_DIFF="14.9"/>
      <bbk:Obs TIME_PERIOD="1971-02" OBS_VALUE="1515.765" BBK_DIFF="3211.5"/>
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  </bbk:DataSet>
</CompactData>
