This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories.
This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme.
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This category contains all pages labeled with ((Better source)), ((Obsolete source)), ((Primary sources)), ((Unreliable sources)), ((Verify credibility)), ((Third-party)), ((Third-party-inline)), and ((Circular reference)). It exists primarily for bot-based monitoring of articles which don't have reliable sources. By-month categories are located in Category:Articles lacking reliable references.