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In order to select data taken only by commercial ships, excluding
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specialist ship data sources, such as research vessels a selection criteria has been established.
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specialist ship data sources such as research vessels, a selection criteria has been established.
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Data selection rules are shown in following table. Reports require a day of the month present and to be valid (e.g. 30 Feb not used), but data with a missing hour are included for certain `dck` between 1850 and 1872.
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| ... | ... | |
