645 SERIES TRACING PRACTICE (R)
Indicators Both undefined; each contains a blank (^)
Subfield Codes $a Series tracing practice (NR) t Traced as a series added entry n Not traced as a series added entry $d Volumes/dates to which tracing practice applies (NR) $5 Institution/copy to which field applies (R) $6 Linkage (NR) $8 Field link and sequence number (R)