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A group of separately published works, usually related to each other in subject, each of which bears, in addition to its own title, a collective or series title which applies to the group as a whole. The individual items are issued successively by the same publisher and may or may not be numbered. The series title usually appears on the half title page or the cover, and at the top of the title page or on a page following the title page. Monographs and reference books are often published in series.