055 Subfield $2 - Source of call/class number:

Subfield $2 contains a code that identifies the source list or scheme from which the call/class number was assigned. It is used only when the second indicator contains value 6 (Other call number assigned by NLC ), 7 (Other class number assigned by NLC ), 8 (Other call number assigned by the contributing library ), or 9 (Other class number assigned by the contributing library ). The codes to be used in the subfield are listed in MARC Code List for Relators, Sources, Description Conventions .

Example:

055 18$aKF385 ZA2$b.T34 1989$2kfmod

[Call number assigned from KF Classification, Modified for Use in Canadian Law Libraries.]