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    <marc:controlfield tag="007">cr |||||||||||</marc:controlfield>
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      <marc:subfield code="a">The geochemistry of acid mine drainage </marc:subfield>
      <marc:subfield code="h">[electronic resource]</marc:subfield>
      <marc:subfield code="c">by D. W. Blowes ... [et al.].</marc:subfield>
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      <marc:subfield code="a">[Burlington, Ont.] : </marc:subfield>
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      <marc:subfield code="c">[2003]</marc:subfield>
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      <marc:subfield code="q">PDF</marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2019/eccc/En13-5-03-170-eng.pdf</marc:subfield>
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