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.

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Health related message boards offering discussions of numerous health topics including allergies, cancer, diabetes, heart disease, exercise, attention deficit disorder, diet, and nutrition.

Providing a comprehensive, yet practical, resource for all clinical laboratorians through detailed explanations of laboratory tests, transfusion guidelines, method evaluation protocols, test utilization guidelines and algorithms.