Drilling into the unknown
Published in 32 languages; includes a selection in Braille in eng, fre, spa, kor
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| Main Author: | |
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| Format: | article biblioteca |
| Language: | eng ara chi rus |
| Subjects: | Mining, Resources exploration, Geophysical prospecting, Rocks, Mineral deposits, Earth's crust, |
| Online Access: | https://unesdoc.unesco.org/ark:/48223/pf0000069533 |
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