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In 'library-speak', a periodical is anything that is published on a regular basis such
as a magazine. A periodical index points out where articles on certain subjects appear
in many different magazines, journals and newspapers.
Back in the day, periodical indexes used to be compiled and printed in volumes. If your
library has been around for awhile, you can probably find a couple of these older, dusty
indexes. The Readers' Guide to Periodical Literature, those green volumes you may
have used to find articles for your term papers, are periodical indexes too.
Now, many indexes are available online from your library. Some may only be available if
you visit the library in person, while others are accessible over the Web. Besides the
standard citation information, some of these newer indexes contain abstracts or even the
full text of the article online.
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