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      <marc:subfield code="a">Tétreault, Jean, </marc:subfield>
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      <marc:subfield code="a">Technical bulletin, </marc:subfield>
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      <marc:subfield code="a">Issued also in French under title: Gel de silice : contrôle passif de l’humidité relative.</marc:subfield>
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      <marc:subfield code="a">Includes bibliographical references (pages 21-22).</marc:subfield>
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      <marc:subfield code="a">Technical bulletin (Canadian Conservation Institute)</marc:subfield>
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      <marc:subfield code="v">no. 33.</marc:subfield>
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