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      <marc:subfield code="a">MacDonald, Lorne G., </marc:subfield>
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      <marc:subfield code="a">An assessment of the effects of runoff from cattle feedlots on the water quality of receiving streams / </marc:subfield>
      <marc:subfield code="c">by Lorne G. MacDonald ; report prepared for the Social Sciences Division, Canada Centre for Inland Waters.</marc:subfield>
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      <marc:subfield code="b">Environment Canada, Canada Centre for Inland Waters = Environnement Canada, Centre Canadien des Eaux Intérieures, </marc:subfield>
      <marc:subfield code="c">September 1973.</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">Includes bibliographical references (pages 150-153).</marc:subfield>
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      <marc:subfield code="u">https://publications.gc.ca/collections/collection_2019/eccc/en36-522/En36-522-20-1973-eng.pdf</marc:subfield>
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