All Internal System Reference

A small category of source entities that point back into the atlas's own system rather than to an external publication, used where a fact's grounding is the atlas's own prior research or an internal cross-check rather than a citable outside page. Belongs here: any source entity recorded as an internal reference rather than a fetchable external article. Does not belong here: the ordinary external encyclopedia articles the great majority of the atlas's facts cite, which belong under Encyclopedia Article.