The fields in this report include a primary heading which did not match an established heading or cross reference in any authority record. The primary heading in a field includes different subfields depending on the heading type. For example, the primary heading in a Personal Name (x00) heading includes the $a subfield plus any $c, $q, or $d subfields present. For subject (6xx) headings, only authority records in the related national authority file (and internal BSLW authority files) are checked for matching records. For example, a Topical Subject (650) heading with a second indicator zero is only matched against the LC Subject Authority File unless special processing is requested.

The majority of non-65x headings in this report will normally be headings which are valid, but have not yet been established, i.e., an authority record has not yet been added to the national authority file for that heading. Some of the headings, however, will be incorrect forms of established headings that could not be corrected during automated authority control processing.