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      <marc:subfield code="a">Marvin, Christopher H.</marc:subfield>
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      <marc:subfield code="a">Spatial and temporal patterns in mercury contamination in sediments of the Laurentian Great Lakes </marc:subfield>
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      <marc:subfield code="c">Chris Marvin, Scott Painter and Ronald Rossman.</marc:subfield>
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      <marc:subfield code="a">"Data from recent sediment surveys have been collated and mapped in order to determine the spatial distribution of mercury in sediments across the entire Great Lakes basin. Information from historical surveys has also been collated in order to evaluate temporal trends"--Abstract.</marc:subfield>
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