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- Language: English
- Year: 2007

- Author: Christine Johnson
- Language: English
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- Author: Steve Thompson
- Language: English
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- Author: M Harris David Mower
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- Author: Rachel A. Koestler-Grack
- Language: English
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- Author: Liz Soars John Soars Amanda Maris
- Language: English
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- Author: Jeffrey Reiman Louis P. Pojman
- Language: English
- Year: 1997

- Author: Rachel A. Koestler-Grack William H. Goetzmann
- Language: English
- Year: 2006

- Author: C. W. Crawley
- Language: English
- Year: 1965

- Author: J. S. Bromley
- Language: English
- Year: 1970