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Baen's eBook marketplace. eBooks with no DRM in every major format--for the Kindle, iPad, Nook, and more.

PubMed® comprises more than 35 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

AMiner由清华大学计算机科学与技术系建立，包含了超过3.2亿学术论文/专利和1.33 亿学者的科技图谱，提供学术检索、论文检索，推荐订阅、论文专利、学者画像、文献追踪、趋势分析等科技情报服务，是拥有我国完全自主知识产权的学术科技情报大数据挖掘与服务系统平台。

Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.

Access articles, reports and multimedia content in HEP

A+医学百科是一个开放的在线医学百科全书网站，涵盖疾病百科、症状百科、药品百科、急救百科等医学保健知识。欢迎加入A+医学百科，与我们一起普及医学常识，推广健康生活方式。

The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

得到推荐电子书，樊登解读电子书，畅销书电子版，经典书电子版，为学习者提供试读学习

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