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      <marc:subfield code="a">Mercury in the Ontario environment / </marc:subfield>
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      <marc:subfield code="a">"This report provides data on the level of mercury contamination in Ontario. Sampling has been carried out in this province by many agencies and as a result significant amounts of data are available for many parameters; fish, wildlife, water, sediment, air, vegetation, etc."--Abstract.</marc:subfield>
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