Field definition and scope:

Field 050 contains a classification number or call number assigned either by the Library of Congress or by other agencies using the Library of Congress Classification or LC Classification--Additions and Changes.  The second indicator values distinguish between content actually assigned by the Library of Congress and content assigned by an organization other than LC.

Field 050 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 050

Library of Congress Classification Number

R

Indicator:

 

 

First

Undefined; contains a blank

 

 

 

 

Second

Source of class number

 

0

Assigned by LC

 

4

Assigned by agency other than LC

 

 

 

 

Subfield code:

 

 

$a

Classification number

R

$b

Item number

NR

$3

Materials specified

NR

$6

Linkage

NR

$8

Field link and sequence number

R

Input conventions:

Punctuation

Capitalization

Spacing

Related MARC fields or documents:

Library of Congress Classification

LC Classification--Additions and Changes

Cutter-Sanborn Three-Figure Author Table

Subject Cataloging Manual:  Shelflisting

See also:

01X-09X  Numbers and Codes

Variable Data Fields