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21Subjects: “…natuurbescherming…”
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22Subjects: “…natuurbescherming…”
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23
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24
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25
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26
Date 1997
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27
Date [1995]
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28Subjects: “…natuurbescherming…”
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29Based on the WWF International report 'A synthesis of phyto- and zooplankton dynamics of the North Sea environment' ...Subjects: “…natuurbescherming…”
By Schmidt-van Dorp, A.D.
Date 1994
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30Subjects: “…natuurbescherming…”
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31Subjects: “…natuurbescherming…”
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32
Date 1991
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33
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34
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35
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36
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37
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38
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39
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40