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Author: Stein Aurél.
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Man-made and natural |
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 Geography – School pocket books |
Description of the Earth’s more than 600 minerals. Author: KORBEL, PETR-NOVÁK, MILAN |
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What is worth knowing about crystals. Author: Hall, Judy |
China and India in the focus. |
Author: Takács-Sánta András |
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