Periodical indexes help you find an article by a specific subject so the answer is: <span>a tool to help find the periodicals that contain articles on a particular subject</span>
Answer: a tool to help find the periodicals that contain articles on a particular subject.
A periodical index is a tool that contains the subject, author and keywords of a particular list of periodicals. This tool helps you find articles about specific topics. The way to look through an index is similar to that of looking for items in a library catalog.
