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| 005 | 20220912145525.0 | ||
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| 082 | _aE:154p1:N60, K1 | ||
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| 111 | _aComfrence on niobium tantalum, malybdeum and tungstem (1960 : Universuty of sheffield) | ||
| 245 | 0 | _aReport on nibbium, tantalum, malybedenum and tumgstem | |
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