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  1. 1
    by Shea, Cynthia Pollock
    Published 1988
    “...Worldwatch paper ;...”
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    Protecting life on earth : steps to save the ozone layer /
  2. 2
    by Shea, Cynthia Pollock
    Published 1988
    “...Worldwatch paper ;...”
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    Renewable energy : today's contribution, tomorrow's promise /

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