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1Published 1998“…Worldwatch Institute…”
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2“…Worldwatch Institute…”
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3“…Worldwatch Institute…”
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4Published 2000“…Worldwatch Institute…”
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6Published 1993“…Worldwatch Institute…”
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7Published 2005“…worldwatch institute…”
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8
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9Published 1991“…Worldwatch Institute…”"Special 20th anniversary edition"--Dust jacket.
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11Published 1999“…Worldwatch Institute…”
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12Published 1996“…Worldwatch Institute…”
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13Published 1988“…Worldwatch Institute…”
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14Published 1984“…Worldwatch Institute…”
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