Per a Policy Vote of March 27, 2011, there is now a field at the Series level field to indicate whether a Series has only a single issue by design. This "is_singleton" flag is set when editing a Series. It shall be used only when it can be determined that the "series" was designed to consist of a single, standalone publication, NOT when a Series just happens to have ended up as a single issue.
* If an issue includes a frequency in the indicia, it is an indication that it was not intended to be a singleton.
(end of definition)
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