Open Access - International index of high-quality, peer-reviewed journals and scientific articles that do not include embrago periods.
Open Access - Online versions of the comprehensive medical information source. The Merck Manuals cover thousands of topics in all fields of medicine and are separated by professional, consumer, and veterinary editions.
Open Access - Full-text archive of biomedical and life sciences journal literature indexed by the National Institutes of Health.
Offers a comprehensive, curriculum-oriented overview of a broad range of scientific disciplines through extensive essays, diagrams, illustrations, images, biographies, experiments, activities, and definitions.