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      <marc:subfield code="a">Berman, Robert G. </marc:subfield>
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      <marc:subfield code="a">U-Pb zircon ages of plutonic rocks in the eastern Slave Craton and adjacent Thelon tectonic zone, Nunavut, determined by laser-ablation inductively coupled multi-collector mass spectrometry / </marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (pages 18-20).</marc:subfield>
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