Choices of depth
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10 meter 

1989
    Apr 13-Apr 27 Apr 28-May 12
    May 13-May 27 May 28-Jun 11
1991
    Apr 30-May 14 May 15-May 29
    May 30-Jun 13 Jun 14-Jun 28
    Jun 29-Jul 13 Jul 14-Jul 28
    Jul 29-Aug 12 Aug 13-Aug 27
    Aug 28-Sep 11
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30 meter 

1989
    Apr 12-Apr 26 Apr 27-May 11
    May 12-May 26 May 27-Jun 10
    Jun 11-Jun 25
1991
    Apr 29-May 13 May 14-May 28
    May 29-Jun 12 Jun 13-Jun 27
    Jun 28-Jul 12 Jul 13-Jul 27
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: select and get particular columns of data

50 meter 

1989
    Apr 13-Apr 27 Apr 28-May 12
    May 13-May 27 May 28-Jun 11
    Jun 12-Jun 26
1991
    Apr 30-May 14 May 15-May 29
    May 30-Jun 13 Jun 14-Jun 28
    Jun 29-Jul 13 Jul 14-Jul 28
    Jul 29-Aug 12 Aug 13-Aug 27
    Aug 28-Sep 11
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70 meter 

1991
    Apr 29-May 13 May 14-May 28
    May 29-Jun 12 Jun 13-Jun 27
    Jun 28-Jul 12
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90 meter 

1989
    Apr 13-Apr 27 Apr 28-May 12
    May 13-May 27 May 28-Jun 11
    Jun 12-Jun 26
1991
    Apr 29-May 13 May 14-May 28
    May 29-Jun 12 Jun 13-Jun 27
    Jun 28-Jul 12 Jul 13-Jul 27
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: select and get particular columns of data

110 meter 

1989
    Apr 12-Apr 26 Apr 27-May 11
    May 12-May 26 May 27-Jun 10
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150 meter 

1989
    Apr 13-Apr 27 Apr 28-May 12
    May 13-May 27 May 28-Jun 11
    Jun 12-Jun 26
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: select and get particular columns of data

250 meter 

1989
    Apr 12-Apr 26 Apr 27-May 11
    May 12-May 26 May 27-Jun 10
    Jun 11-Jun 25