- Author: Summers Michael E, Trefil James
- Language: English
- Year: 2017
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- Language: English
- Year: 2017
- Author: Michael E. Summers, Trefil James
- Language: English
- Year: 2017
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- Language: English
- Year: 2001
1001 spotkań z nauką
djvu
- Author: Trefil James
- Language: Polish
- Year: 1997