PubMed Central is the U.S. National Institutes of Health (NIH) free digital archive of biomedical and life sciences journal literature comprising journals that deposit material in PMC on a routine basis and generally make all their published articles available here.
PubMed: the National Library of Medicine's bibliographic database covering the fields of medicine, nursing, dentistry, veterinary medicine, the health care system, and the preclinical sciences. It provides coverage of biomedical journals from the United States and 80 other countries, dating back to the mid-1950's.
SimplyAnalytics (formerly SimplyMap): a web-based mapping application with a user-friendly interface that permits users to quickly and easily create professional-quality thematic maps and reports using thousands of demographic, business, and marketing variables.
Other Health and Medicine Databases: