087 First indicator:  Value 0 - Superintendent of Documents Classification System

Value 0 indicates that the number source is the U.S. Superintendent of Documents Classification System.  Superintendent of Documents classification numbers are assigned only by the U.S. Government Printing Office (GPO).  They may be input by other institutions if verified in the Monthly Catalog of United States Government Publications or the Daily Depository Shipping List.

Example:

110  1#  $aUnited States.$bCongress.$bHouse.$bSelect Committee on Narcotics Abuse and Control

087  0#  $aY 4.N 16