027 Standard Technical Report Number

Field definition and scope:

Field 027 contains an International Standard Technical Report Number (ISRN) or a Standard Technical Report Number (STRN) assigned to a technical report. Assignment of STRNs is coordinated by the National Technical Information Service (NTIS), which also maintains an assignment registry.

It is formulated according to specification in the standards International Standard Technical Report Number (ISRN) (ISO 10444), Standard Technical Report Number Format and Creation (ANSI/NISO Z39.23-1997), or Standard Technical Report Number (STRN), Format and Creation (ANSI Z39.23-1983). The technical report number is usually the primary means of identifying a specific technical report.

Field 027 is repeatable for multiple ISRNs and STRNs associated with an item.

The National level record requirement for this field is Mandatory if applicable.

Field 027 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 027	Standard Technical Report Number	A	O	R
Indicator:
First	Undefined; contains a blank	M
Second	Undefined; contains a blank	M

Subfield code:
$a	Standard technical report number	M	O	NR
$q	Qualifying information			R
$z	Canceled/invalid number	A	O	R
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Number structure

Punctuation

Content designator history:

Subfield $q - Qualifying information [new, 2013]