060 National Library of Medicine Classification Number

Field definition and scope:

Field 060 contains either a complete National Library of Medicine (NLM) call number or classification number assigned by either the National Library of Medicine or by other agencies using the National Library of Medicine Classification. The second indicator values distinguish between content actually assigned by the National Library of Medicine and content assigned by an organization other than NLM.

Field 060 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position	Description	Repeatability
Field 060	National Library of Medicine Classification Number	R
Indicator:
First	Undefined; contains a blank

Second	Source of class number
0	Assigned by NLM
4	Assigned by agency other than NLM

Subfield code:
$a	Classification number	R
$b	Item number	NR
$8	Field link and sequence number	R

Input conventions:

Punctuation

Spacing