035 System Control Number

Field definition and scope:

Field 035 contains a system control number for a record that belongs to a system other than the one whose control number is contained in field 001 (Control Number), field 010 (Library of Congress Control Number), or field 016 (National Bibliographic Agency Control Number). For interchange purposes, documentation of the structure and use of the system control number must be provided to exchange partners by the originating organization. Each valid system control number and any related canceled/invalid control number are contained in a separate 035 field.

The National level record requirement for this field is Optional.

Field 035 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	MLR	Repeatability
Field 035	System Control Number	O	O	R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	System control number	M	O	NR
$z	Canceled/invalid control number	A	O	R
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Structure