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There are several types of common indexes. The most familiar is the back-of-book index. Back-of-book indexes contain references to information in only one volume. Most nonfiction, single-volume texts include this sort of index. Multivolume indexes contain references to information in more than one volume. The page references in a multivolume index must indicate clearly both the volume number and the page number of the cited information. Most encyclopedias include multivolume indexes. Magazines and newspapers also have indexes. These periodical indexes are published separately, at regular intervals throughout the year, and are extremely helpful to researchers.