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| international reference system (of the International Bureau of Weights and Measures for activity measurement of γ-emitting nuclides) | |||
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| International Referral System | |||
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| International Referral System | |||
| Système International de Référence: 8 phrases in 3 subjects |
| Environment | 5 |
| General | 1 |
| United Nations | 2 |
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