Knovel Basic - scientific and engineering reference books, including many polymer titles.
National Academies Press - reports issued by the National Academy of Science, the National Academy of Engineering, the Institute of Medicine, and the National Research Council; publishes more than 200 books a year on a wide range of topics in science, engineering, and health.
Safari Tech Books Online - electronic books in computer science, information technology, and related fields from O'Reilly and Associates and Pearson Technology Associates.
University of Virginia Library's Etext Center - including classic British and American fiction, major authors, children's literature, American history, Shakespeare, African-American documents, the Bible, and much more.