X10 Subfield $b - Subordinate unit:
Subfield $b contains a name of a subordinate corporate unit, a name of a city section, or a name of a meeting entered under a corporate or a jurisdiction name.
Examples:
110 1#$aUnited States.$bCongress.$bJoint Committee on the Library.
110 2#$aAmerican Veterinary Medical Association.$bMeeting.
110 2#$aFreemasons.$bConcordia Lodge, No. 13 (Baltimore, Md.)
110 1#$aParis.$bMontmartre.
[Pre-AACR 2 formulated heading]