Periodicals are continuous publications such as journals, newspapers, or magazines.
The Catalog does not include information about the articles within those periodicals. To find a periodical article, use periodical indexes. When you don't have a citation to a specific article, but you do want to find articles on a subject, by a specific author or authors, or with a known article title, you can use one or more periodical indexes. First determine what kind of periodicals you want. If you're not sure which kind of periodical you want or you're not sure which periodical index to use, ask a librarian.