Special issues may be published within the numbering scheme or in addition to the regular issues of the serial. They usually cover a particular topic and may have a distinctive title. In other cases, they may be called nothing but a "Special issue" or the equivalent. Special issues may be numbered or unnumbered. Like supplements, some special issues are serials in themselves; others are not. The decision on how to catalog special issues depends on (a) the presence of a distinctive number (b) the importance of the content, and (c) the presence of numbering.
General
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Integrations