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