037 SOURCE OF ACQUISITION (R)Indicators - Both undefined; each contains a blank (^)Subfield Codes $a Stock number (NR) $b Source of stock number/acquisition (NR) $c Terms of availability (R) $f Form of issue (R) $g Additional format characteristics (R) Provisional $n Note (R) $6 Linkage (NR) $8 Field link and sequence number (R)