Abstract：
Bookshelf is a database maintained by the National Center for Biotechnology Information (NCBI) at the National Library of Medicine that contains freely accessible online biomedical documents, including systematic reviews, technical reports, textbooks, and reference books. The database allows users to browse and search across all content and within individual books, and it is linked to other NCBI content. This article provides an overview of Bookshelf and demonstrates its usage in a sample search. The resources available in Bookshelf are useful for students, researchers, healthcare professionals, and librarians.
摘要：
书架是由国家医学图书馆的国家生物技术信息中心（NCBI）维护的数据库，其中包含免费访问的在线生物医学文件，包括系统审查，技术报告,教科书,和参考书。该数据库允许用户浏览和搜索所有内容和个人书籍，并链接到其他NCBI内容。本文概述了Bookshelf，并演示了它在示例搜索中的用法。书架中可用的资源对学生有用，研究人员,医疗保健专业人员,和图书馆员。
