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What is a periodical index?
a tool to help find the periodicals that contain articles on a particular subject
a file that lists all the pamphlets, photographs, and newspapers a library owns
a guide that offers recommendations for particular magazines based on interest

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Periodical indexes help you find an article by a specific subject so the answer is: a tool to help find the periodicals that contain articles on a particular subject

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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.