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1Izdano 1998“...Worldwatch Institute...”
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2“...Worldwatch Institute...”
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3“...Worldwatch Institute...”
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4Izdano 2000“...Worldwatch Institute...”
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5
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6Izdano 1993“...Worldwatch Institute...”
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7Izdano 2005“...worldwatch institute...”
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8
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9Izdano 1991“...Worldwatch Institute...”"Special 20th anniversary edition"--Dust jacket.
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10
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11Izdano 1999“...Worldwatch Institute...”
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12Izdano 1996“...Worldwatch Institute...”
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13Izdano 1988“...Worldwatch Institute...”
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14Izdano 1984“...Worldwatch Institute...”
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15