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653 - INDEX TERM--UNCONTROLLED (R)
An index term added entry that is not constructed by standard subject heading/thesaurus-building conventions.
Indicators
- First - Level of index term
- # - No information provided
- 0 - No level specified
The level of the term could be determined but is not specified.
- 1 - Primary
The term describes the main focus or subject content of the material.
- 2 - Secondary
The subject term describes a less important aspect of the content of the material.
- Second - Undefined
- # - Undefined
Subfield Codes
- $a - Uncontrolled term (R)
- $6 - Linkage (NR) See Control Subfields
- $8 - Field link and sequence number (R) See Control Subfields
Examples
653 |
1#$afuel cells$amolten carbonate$apower generation |
653 |
##$aMan$aEyes$aDiseases |

