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- Language: English
- Year: 1908

- Author: John F. W. Herschel
- Language: English
- Year: 1862

- Author: Georges Pages
- Language: English
- Year: 1970

- Author: WILLIAM PALIN ELDERTON, RICHARD C. FIPPARD
- Language: English
- Year: 1914

- Author: Pitirim A. Sorokin
- Language: English
- Year: 1952

- Author: Austin Farrer
- Language: English
- Year: 1967

- Author: Frank Elias
- Language: English
- Year: 1913

- Author: W. C. Costin, J. Steve Watson
- Language: English
- Year: 1964

- Author: W. C. Costin, J. Steve Watson
- Language: English
- Year: 1962