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  <titleInfo>
    <title>Variabilidad de cuatro características de calidad del agua en el Río Tula (tramo Presa Requena-Ixmiquilpan)</title>
  </titleInfo>
  <name type="personal">
    <namePart>Díaz Magaña, José Alfredo.</namePart>
    <role>
      <roleTerm authority="marcrelator" type="text">creator</roleTerm>
    </role>
  </name>
  <typeOfResource>text</typeOfResource>
  <originInfo>
    <place>
      <placeTerm type="text">Montecillo, Méx</placeTerm>
    </place>
    <publisher>El autor</publisher>
    <dateIssued>1990</dateIssued>
    <issuance>monographic</issuance>
  </originInfo>
  <physicalDescription>
    <extent>181 h. : ilus. ; gráfs.</extent>
  </physicalDescription>
  <note>42-151</note>
  <note>Tesis (M.C. Esp. en Edafología) -- C.P. Centro de Edafología</note>
  <subject>
    <topic>Agua</topic>
    <topic>Análisis</topic>
  </subject>
  <subject>
    <topic>Agua</topic>
    <topic>Aprovechamiento</topic>
  </subject>
  <subject>
    <topic>Agua</topic>
    <topic>Calidad</topic>
  </subject>
  <subject>
    <topic>Agua</topic>
    <topic>Contaminación</topic>
  </subject>
  <subject>
    <topic>Agua</topic>
    <topic>Utilización</topic>
  </subject>
  <subject>
    <topic>Presas</topic>
    <topic>Hidalgo</topic>
  </subject>
  <subject>
    <topic>Río Tula</topic>
  </subject>
  <identifier type="lccn">1627</identifier>
  <recordInfo>
    <recordContentSource authority="marcorg"/>
    <recordCreationDate encoding="marc">971013</recordCreationDate>
    <recordChangeDate encoding="iso8601">20220329133042.0</recordChangeDate>
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