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      <marc:subfield code="a">Joyce, N. L. </marc:subfield>
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      <marc:subfield code="a">A compilation of 40Ar/39Ar age determinations for igneous and metamorphic rocks, and mineral occurrences from central and southeast Yukon / </marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (pages 224-229).</marc:subfield>
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      <marc:subfield code="a">"The samples were collected across a wide-range of geographic and geologic regions, to answer a wide range of questions. In this report they have been divided into groups of related samples, and for each grouping, a brief discussion of the rationale for 40Ar/39Ar analyses and first-order interpretations is presented"--Introduction, page 5.</marc:subfield>
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