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  1. 1
    “...Worldwatch Institute,...”
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    Mining the earth /
  2. 2
    by Ryan, John C.
    Published 1992
    “...Worldwatch Institute,...”
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    Life support: conserving biological diversity /
  3. 3
    by Renner, Michael, 1957-
    Published 1993
    “...Worldwatch Institute,...”
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    Critical juncture : the future of peacekeeping /

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