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  <titleInfo>
    <title>Lead</title>
    <subTitle>its occurrence in nature, the modes of its extraction, its prperties and uses, with some account of its principal compounds</subTitle>
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  <name type="personal">
    <namePart>Smythe, J. A.</namePart>
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    <publisher>Longmans Green and Co</publisher>
    <dateIssued>1923</dateIssued>
    <issuance>monographic</issuance>
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    <extent>343 p. ; 22 cm</extent>
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  <subject>
    <topic>Geología económica</topic>
  </subject>
  <subject>
    <topic>Plomo</topic>
  </subject>
  <classification authority="udc">553.44</classification>
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