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      <marc:subfield code="a">Kirchhefer, S. A., </marc:subfield>
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      <marc:subfield code="a">Discussion report for hydrographic and current survey / </marc:subfield>
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      <marc:subfield code="a">[Burlington, Ont.] : </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">"This report investigates the geometry, hydraulics and operational needs with respect to containing oil spills in the Detroit and St. Clair Rivers. The studies indicate that only a few locations may be suitable to trap oil. Consequently, hydrographic and current surveys may only be required at certain locations"--Abstract.</marc:subfield>
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      <marc:subfield code="a">Hydrographic surveying</marc:subfield>
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      <marc:subfield code="a">Hydrographic surveying</marc:subfield>
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      <marc:subfield code="a">Déversements de pétrole</marc:subfield>
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      <marc:subfield code="a">Déversements de pétrole</marc:subfield>
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      <marc:subfield code="a">Levés hydrographiques</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Unpublished manuscript (Canada Centre for Inland Waters)</marc:subfield>
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