A small number of citations this atlas records for its own internal record-keeping rather than as a reader-facing external source, generally a placeholder or a self-referential note captured during data entry rather than a genuine external citation. Belongs here: a citation whose own record identifies it as an internal system reference. Does not belong here: any citation to an external publication, institution or web page, each tracked under its own proper source kind rather than filed here as an internal note.
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