Arbitrary Lines
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- Author: Katherine Miller
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Vital Signs 2011
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- Author: The Worldwatch Institute
- Language: English
- Year: 2015
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- Language: English
- Year: 2013
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- Year: 2013
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- Year: 2013
Vital Signs 2010
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- Author: The Worldwatch Institute
- Language: English
- Year: 2015
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- Year: 2005
