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- Author: Robert Samuel Summers
- Language: English
- Year: 1982
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- Author: D. Neil MacCormick Robert S. Summers
- Language: English
- Year: 1991
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- Author: Robert S. Summers
- Language: Spanish
- Year: 2001
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- Year: 1983
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- Year: 2000
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- Language: English
- Year: 2005