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for subject
Librarianship
containing
virtual reference services
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in specified order only
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Chinese
asynchronous
virtual reference service
异步数字参考咨询服务
collaborative
virtual reference service
合作虚拟咨询
Guidelines for Implementing and Maintaining
Virtual Reference Services
美国图协
虚拟参考服务实施与维护指南
synchronous
virtual reference services
同步数字参考咨询服务
virtual reference services
虚拟参考咨询服务
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