- Author: Santayana George
- Language: English
- Year: 1927
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- Language: English
- Year: 2009
- Author: Santayana George
- Language: English
- Year: 2011
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- Year: 2009
- Author: Alexander Thomas M., Buchler Justus, Dewey John, Putnam Hilary, Rorty Richard, Santayana George
- Language: English
- Year: 2013
- Author: Singer Irving, Santayana George
- Language: English
- Year: 2000
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- Year: 1944
- Author: Santayana George
- Language: English
- Year: 1945
- Author: Santayana George
- Language: English
- Year: 1953
- Author: Santayana George
- Language: English
- Year: 1925