646 SERIES CLASSIFICATION PRACTICE (R)
Indicators First Undefined; contains a blank (^) 0 Current numbering example [OBSOLETE] 1 Earlier numbering example [OBSOLETE] Second Undefined; contains a blank (^)
Subfield Codes $a Series classification practice (NR) c Volumes are classified as a collection m Volumes are classified with main or other series s Volumes are classified separately $d Volumes/dates to which classification practice applies (NR) $5 Institution/copy to which field applies (R) $6 Linkage (NR) $8 Field link and sequence number (R)