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American Literature 1700 to present; English Literature 700 to present; Western philosophy 400 BC to present.

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Bookshelf provides free access to books and documents in life science and healthcare.

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Merck has created The Merck Manuals, a series of healthcare books for medical professionals and consumers. As a service to the community, the content of The Manuals is now available in enhanced online versions.

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Bookshelf provides free access to books and documents in life science and healthcare. A vital node in the data-rich resource network at NCBI, Bookshelf enables users to easily browse, retrieve, and read content, and spurs discovery of related information

Astronomy; Biology; Chemistry; Computer science; Earth sciences; Engineering; Mathematics; Medicine; Physics.

Biography; Children's Literature; Fiction; Health & Lifestyle; History; Philosophy; Politics; Psychology; Religion & Spirituality; Self-Help; Travel; Young Adult Literature.