2.Allrefer reference & encyclopedia resource Allrefer.com provides articles in all areas of topics within earth & environment, history, literature & arts, health & medicine, people, philosophy & religion, places, plants & animals, science & technology, social science, law, sports, everyday life, and... http://reference.allrefer.com/ - 27.07.2006 à 19:35
3.National library of medicine - national institutes of health 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... http://www.nlm.nih.gov/ - 26.07.2006 à 05:26
5.Pubmed central homepage Pubmed central is an archive of life sciences journal literature that is developed and managed by the national center for biotechnology information (ncbi) at the u.s. national library of medicine (nlm).... http://www.pubmedcentral.nih.gov/ - 25.07.2006 à 13:22
