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      <marc:subfield code="a">En36-522/70-1978E-PDF</marc:subfield>
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      <marc:subfield code="a">Robertson, D. G., </marc:subfield>
      <marc:subfield code="e">author.</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="245" ind1="1" ind2="0">
      <marc:subfield code="a">Digital bathymetry of Lakes Ontario, Erie, Huron, Superior and Georgian Bay / </marc:subfield>
      <marc:subfield code="c">D.G. Robertson and D.E. Jordan.</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="264" ind1=" " ind2="1">
      <marc:subfield code="a">Burlington, Ontario : </marc:subfield>
      <marc:subfield code="b">Applied Research Division, Canada Centre for Inland Waters, </marc:subfield>
      <marc:subfield code="c">[1978]</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 (page 5).</marc:subfield>
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    <marc:datafield tag="650" ind1=" " ind2="0">
      <marc:subfield code="a">Bathymetric maps</marc:subfield>
      <marc:subfield code="x">Data processing.</marc:subfield>
    </marc:datafield>
    <marc:datafield tag="650" ind1=" " ind2="0">
      <marc:subfield code="a">Submarine topography</marc:subfield>
      <marc:subfield code="z">Great Lakes (North America)</marc:subfield>
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    </marc:datafield>
    <marc:datafield tag="650" ind1=" " ind2="6">
      <marc:subfield code="a">Cartes bathymétriques</marc:subfield>
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      <marc:subfield code="a">Topographie sous-marine</marc:subfield>
      <marc:subfield code="z">Grands Lacs (Amérique du Nord)</marc:subfield>
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      <marc:subfield code="a">Canada Centre for Inland Waters.</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/en36-522/En36-522-70-1978-eng.pdf</marc:subfield>
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