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      <bbk:Obs TIME_PERIOD="1972-04" OBS_VALUE="-94.498" BBK_DIFF="-64.8" BBK_DIFF_Y="-145.6"/>
      <bbk:Obs TIME_PERIOD="1972-03" OBS_VALUE="-57.344" BBK_DIFF="-212.3" BBK_DIFF_Y="-138.0"/>
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      <bbk:Obs TIME_PERIOD="1972-01" OBS_VALUE="229.275" BBK_DIFF="229.3" BBK_DIFF_Y="133.2"/>
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      <bbk:Obs TIME_PERIOD="1971-10" OBS_VALUE="-65.194" BBK_DIFF="50.5"/>
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      <bbk:Obs TIME_PERIOD="1971-08" OBS_VALUE="111.65" BBK_DIFF="403.0"/>
      <bbk:Obs TIME_PERIOD="1971-07" OBS_VALUE="22.196" BBK_DIFF="116.2"/>
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      <bbk:Obs TIME_PERIOD="1971-05" OBS_VALUE="120.71" BBK_DIFF="-41.7"/>
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      <bbk:Obs TIME_PERIOD="1971-03" OBS_VALUE="-24.093" BBK_DIFF="57.5"/>
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  </bbk:DataSet>
</CompactData>
