A single-part item is held by one library.  Only Levels 1 and 2 are appropriate because there is no numbering to record.

Level 1     <Location Identifier> Main

LDR       *****nx###22*****1##4500

001        <control number>

852  ##  $a<location identifier>$bMain

 

Level 2     <Location Identifier> Main 19870414 (0,ta,4,2,8)

LDR       *****nx###22*****2##4500

001        <control number>

008        8902202p####8###4001aa###0870414

852  ##  $a<location identifier>$bMain

See also:

Appendix B:  Full Level Record Examples

Appendices