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750 - ESTABLISHED HEADING LINKING ENTRY--TOPICAL TERM (R)
A topical term heading that is equivalent to the heading contained in the 150 topical term or 180 general subdivision heading field of the same record. It links headings within a system or from different thesauri or authority files. See field 150 for descriptions of most content designators.
Indicators
- First - Undefined
- # - Undefined
- Second - Thesaurus
The thesaurus or authority file from which the heading came.- 0 - Library of Congress Subject Headings/Name authority file
- 1 - LC subject headings for children's literature
- 2 - Medical Subject Headings/NLM name authority file
- 3 - National Agricultural Library subject authority file
- 4 - Source not specified
- 5 - Canadian Subject Headings/LAC name authority file
- 6 - Répertoire de vedettes-matière
- 7 - Source specified in subfield $2
Subfield Codes
- $a - Topical term or geographic name entry element (NR)
- $b - Topical term following geographic name entry element (NR)
- $v - Form subdivision (R)
- $w - Control subfield (NR) See Heading Linking Entries--General Information
- /0 - Link display
- a - Link not displayed
- b - Link not displayed field 788 used
- c - Link not displayed non-7XX field used
- n - Not applicable
- /1 - Replacement complexity
- a - Heading replacement does not require review
- b - Heading replacement requires review
- n - Not applicable
- /0 - Link display
- $x - General subdivision (R)
- $y - Chronological subdivision (R)
- $z - Geographic subdivision (R)
- $0 - Record control number (R) See Control Subfields
- $2 - Source of heading or term (NR) See Heading Linking Entries--General Information
- $5 - Institution to which field applies (R) See Control Subfields
- $6 - Linkage (NR) See Control Subfields
- $8 - Field link and sequence number (R) See Control Subfields
Examples
750 |
#0$81$wb$aMedical referral |
750 |
#0$81$wb$aMedical consultation |
750 |
#2$81$wb$aOrthopedics |
750 |
#2$81$wb$aRadiography |
750 |
#0$aCancer$xNursing |
750 |
#2$aNeoplasms$xNursing |
750 |
#2$aOncologic Nursing |
750 |
#7$aMilitary training$2lctgm |
750 |
#0$aDrill and minor tactics |
750 |
#0$aUniforms$0[record control number] |
750 |
#0$aSummer resorts$0(DLC)sh#85130430#$wna |

