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      <marc:subfield code="a">Trichtchenko, L. </marc:subfield>
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      <marc:subfield code="a">One-dimensional layered earth models of Canada for GIC applications. </marc:subfield>
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      <marc:subfield code="a">This publication is available for free download through GEOSCAN (https://geoscan.nrcan.gc.ca/).</marc:subfield>
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