750 - Established Heading Linking Entry-Topical Term (R)
MARC 21 Authority - Concise
2007
Topical term that is equivalent to 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 - ThesaurusThesaurus or authority file from which the heading came.
0 - Library of Congress Subject Headings
1 - LC subject headings for children's literature
2 - Medical Subject Headings
3 - National Agricultural Library subject authority file
4 - Source not specified
5 - Canadian Subject Headings
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)
/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
$x - General subdivision (R)
$y - Chronological subdivision (R)
$z - Geographic subdivision (R)
$0 - Record control number (R)
$2 - Source of heading or term (NR)
$5 - Institution to which field applies (R)
$8 - Field link and sequence number (R)
Examples
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| 750 |
#2$aNeoplasms$xNursing
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| 750 |
#2$aOncologic Nursing |
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| 750 |
#7$aMilitary training$2lctgm |
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| 750 |
#0$aDrill and minor tactics |
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| 750 |
#0$aUniforms$0 [record control number]
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