852 Subfield $8 - Sequence number:
Subfield $8 contains data that sequences related holdings records. The sequence number is a variable-length whole number which controls the display and processing sequencing of multiple related holdings records that contain identical 852 subfields $a, $b and $t.
Local systems may add decimal numbers if desired for insertions in an existing sequence. This subfield does not order fields within a record, but locations in separate holdings records.
Subfield $8 (Sequence number) is always the first subfield in the field.
Example:
Holdings record #1:
852 0# $81$a[location identifier]$hcall no.
866 31 $80$a1 v.
[Record for basic bibliographic unit at the first location.]
Holdings record #2:
844 ## $aTeacher's guide
852 0# $82$a[location identifier 1]$hcall no.
854 00 $81$apt.
864 30 $81.1$aA-B
[Record for supplement at the first location; sequence of records for display specified in subfield $8.]
Holdings record #3:
852 0# $81$a[location identifier 2]$hcall no.
866 31 $80$a1 v.
[Record for basic bibliographic unit at second location.]
Holdings record #4:
844 ## $aTeacher's guide
852 0# $82$a[location identifier 2]$hcall no.
854 00 $81$apt.
864 30 $81.1$aA-B
[Record for supplement at second location.]
Sequence numbers 1 and 2 provide a display sequence for related holdings records that have identical locations recorded in field 852 subfields $a and $h to produce the following display:
[location identifier 1] call no. -- 1 v. + "Teacher's guide" pt. A-B
[location identifier 2] call no. -- 1 v. + "Teacher's guide" pt. A-B
To return, select: