The index some of us first used when we began learning how to do research is now online. The Readers’ Guide to Periodical Literature has been indexing the most popular general-interest periodicals in the U. S. and Canada since 1890. This is what you use to find articles published in the 1920s about speakeasies, or an article that appeared in U.S. News and World Report in the 1960s about General Douglas MacArthur, or a review of Mark Twain’s A Connecticut Yankee in King Arthur’s Court that appeared in 1890. Current articles are indexed as well, in some 350 popular magazines. Now you can search all those big green Readers’ Guide volumes at once.