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The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world's largest medical library. It collects materials in all major areas of the health sciences and to a lesser degree in such areas as chemistry, physics, botany and zoology. The collections stand at 5 million items--books, journals, technical reports, manuscripts, microfilms, photographs and images. Housed within the Library is one of the world's finest medical history collections of old (pre-1914) and rare medical texts, manuscripts, and incunabula.

The Immunization Action Coalition (IAC) is the nation's premier source of childhood, adolescent, and adult immunization information for healthcare professionals

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Answers.com: Wiki Q&A combined with free online dictionary, thesaurus, and encyclopedias. Ask questions, get answers.

Dedicated to promoting the commercial development of biobased, environmentally friendly polysaccharide polymers which are useful as fibers, films, coatings, thickeners, rheology modifiers, thermoplastics, drug delivery agents, and emulsifiers.