NASA Astrophysics Data System Journals

The Astrophysics Data System (ADS) is a NASA-funded project which maintains four bibliographic databases containing more than 3.6 million records: Astronomy and Astrophysics, Instrumentation, Physics and Geophysics, and preprints in Astronomy.

National Library of Medicine (NLM) -Bookshelf

Free access to books and documents in life science and healthcare.

Nature (Arabic version)

The Arabic version of Nature, the weekly international journal publishing the finest peer-reviewed research in all fields of science and technology.

Nature Journals

Nature Publishing Group (NPG) is a publisher of high impact scientific and medical information in print and online. NPG publishes journals, online databases, and services across the life, physical, chemical and applied sciences and clinical medicine with more than 89 journals.

Nature Publishing

Nature Publishing is a database that contains academic journals across the life, physical, chemical and applied sciences and clinical medicine.

National Guidelines Clearinghouse (NGC)

NGC is an initiative of the Agency for Healthcare Research and Quality (AHRQ) , U.S. Department of Health and Human Services. NGC was originally created by AHRQ in partnership with the American Medical Association and the American Association of Health Plans (now America's Health Insurance Plans [AHIP]). The NGC mission is to provide physicians and other health professionals, health care providers, health plans, integrated delivery systems, purchasers, and others an accessible mechanism for obtaining objective, detailed information on clinical practice guidelines and to further their dissemination, implementation, and use.


The National Academies Press (NAP) was created by the National Academies to publish the reports issued by the National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council, all operating under a charter granted by the Congress of the United States. NAP offers more than 4,000 titles in PDF format. All of these PDFs can be downloaded for free by the chapter or the entire book.

National Guideline Clearinghouse

Latest clinical practice guidelines based on scientific evidence.

Neuroscience Information Framework

Inventory of Web-based neuroscience resources: public research data, materials, and tools.

NLM Databases and Electronic Resources

The National Library of Medicine (NLM) provides a variety of resources related to the biomedical and health sciences, including databases, bibliographic citations, full text (when available), archival collections, and images.


Collection of sequences from several sources, including GenBank, Reference Sequence (RefSeq), TPA & PDB.

Nursing & Allied Health Database

Information This database offers reliable, comprehensive coverage of the fields of nursing and allied health including journals, video, dissertations, reference books and more.

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