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| referral unit | |||
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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 | |||
| servicio de referencias: 8 phrases in 5 subjects |
| Communications | 2 |
| Environment | 2 |
| General | 2 |
| Natural sciences | 1 |
| United Nations | 1 |