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   Search for "Eutrophication Zones" - The top results (relevance sort) are listed below:
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    Important Legacy denotes outdated data. A more recent version likely exists. Consider an "External Data Source" option linked above, or click the Collection link for updated source options.
    TitleDateSorted in Descending OrderCollectionExtentScaleMD
    CA&DS Framework: Eutrophication Study Zones
    1999 Sub-United States 1:2,000,000