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- Language: English
- Year: 2001
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- Year: 1987
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- Language: English
- Year: 1987
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- Language: English
- Year: 2006
- Author: James H. Beaty James R. Kasser
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- Year: 2005
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- Language: English
- Year: 2007
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- Year: 2005
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- Year: 1997