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      <marc:subfield code="a">Derksen, George, </marc:subfield>
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      <marc:subfield code="a">Shellfish growing water sanitary survey of Campbell River, Quadra Island, Cortes Island and West Redonda Island / </marc:subfield>
      <marc:subfield code="c">by G.D. Derksen, B.Sc. and T.J. Tevendale, P. Eng.</marc:subfield>
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      <marc:subfield code="c">December, 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">"Environmental Protection Service report series."</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (page 28).</marc:subfield>
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      <marc:subfield code="a">"The purpose of the survey was to identify the sources of domestic sewage pollution, assess the bacteriological quality of the shellfish growing waters and classify the area surveyed respecting the health risk to the consumer of shellfish harvested from the areas indicated"--Abstract.</marc:subfield>
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