Mayo Clinic offers award-winning medical and health information and tools for healthy living.

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. Hous

The leading source for trustworthy and timely health and medical news and information. Providing credible health information, supportive community, and educational services by blending award-winning expertise in content, community services, expert commentary, and medical review.

COPD Information and interactive support for COPD, emphysema, bronchitis and chronic asthma patients, caregivers, and families, with chatrooms, message boards, e-mail lists, a quit smoking and exercise program, and a COPD reference library.