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    <subfield code="a">Challenges</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Civil Conflict</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Critic</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Developing Countries</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Distribution</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Ecology</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Germany</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Images</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Interdependency</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Population</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Poverty</subfield>
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  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">War</subfield>
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