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      <marc:subfield code="a">Afghan, B. K., </marc:subfield>
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      <marc:subfield code="a">Clean and hazardous chemicals laboratory at National Water Research Institute, Canada Centre for Inland Waters / </marc:subfield>
      <marc:subfield code="c">by B.K. Afghan and J. Lawrence.</marc:subfield>
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      <marc:subfield code="a">Digitized edition from print [produced by Environment and Climate Change Canada].</marc:subfield>
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      <marc:subfield code="a">"Manuscript 28-AMD-3-81-BKA."</marc:subfield>
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      <marc:subfield code="a">"Submitted to Canadian Research."</marc:subfield>
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      <marc:subfield code="a">"Environmental monitoring for hazardous chemical contaminants produces a constant demand for improved and more sensitive analytical methodologies for quantitative analysis and confirmation at ultra-trace levels (pico-gram or sub-nano gram levels)"--Page 1.</marc:subfield>
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      <marc:subfield code="a">Toxicité.</marc:subfield>
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      <marc:subfield code="a">Canada Centre for Inland Waters.</marc:subfield>
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      <marc:subfield code="a">Unpublished report (Canada Centre for Inland Waters)</marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2020/eccc/en36-522/En36-522-85-1981-eng.pdf</marc:subfield>
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