In this fourth edition of The Oxford Guide to Library Research Thomas Mann spells out the range of amazing resources available in research libraries that cannot be found on the Internet. These include not only the tens of millions of books, journals and other post-1923 printed sources that cannot be digitized because of copyright restrictions, but a rich array of subscription databases in all subject areas that are not accessible on the open Web, but are freely searchable via research libraries. The Oxford Guide to Library Research provides scores of concrete examples drawn from the experience of a veteran reference librarian who has helped tens of thousands of researchers over three decades.