Free Library of Philadelphia
Like social bookmarking? Then you’ll love these weblinks chosen by our expert Librarians.
Chemistry Tutor - Presents information on various aspects of chemistry and links to chemistry-related web sites.
WebElements: the periodic table on the WWW - "A source of information relating to the periodic table. Coverage is such that professional scientists and students at school will all find something useful. You will find thousands of graphics showing elements structures and periodic properties here."