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| reference service The provision of aid by library staff trained to interpret library materials and library organizational structures to meet the informational, educational, cultural, recreational or research needs of the library's clients | |||
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| referral unit | |||
| service de référence: 6 phrases in 4 subjects |
| Aviation | 1 |
| Communications | 3 |
| Information technology | 1 |
| Social science | 1 |