MARC21       766     Secondary Table Information
             $a   Secondary table applicability (NR)
        Contains a code (e.g., code "a" for applicable; code "n" for not applicable) indicating whether
                     or not a secondary table is applicable for breaking down the number or span of numbers in
                     field 153.
             $y   Type of division (R)
             $6   Linkage (NR) See Control Subfields
             $8   Field link and sequence number (R) See Control Subfields

2013 -05 -02
Auszug aus der allegro - Formatedatenbank
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