| First Indicator Undefined # - Undefined |
Second Indicator Thesaurus 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 |
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| $a - Geographic name (NR) $v - Form subdivision (R) $w - Control subfield (NR) /0 - Link display /1 - Replacement complexity $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) $6 - Linkage (NR) $8 - Field link and sequence number (R) |
Geographic name that is equivalent to the 151 geographic name or 181 geographic subdivision field of the same record. It links headings within a system or from different thesauri or authority files.
Most of the content designators defined for field 751 are the same as those defined for field 151 (Heading-Geographic Name), field 451 (See From Tracing-Geographic Name), and field 551 (See Also From Tracing-Geographic Name). Description, guidelines, and input conventions for shared content designators are given in the X51 Geographic Names-General Information section.
Guidelines for applying the second indicator, subfield $w (Control subfield), and subfield $2 (Source of heading or term) in field 751 are given in the 7XX Heading Linking Entries-General Information section.
Equivalent geographic names from different thesauri:
| 008/09 | a [established heading record] |
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| 008/10 | c [code indicating a name heading] |
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| 008/11 | a [code indicating LCSH] |
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| 151 | ##$aNew York (N.Y.) | ||||||||
| 751 | #2$aNew York City [Heading from MeSH] |
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| 008/09 | a [established heading record] |
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| 008/10 | c [code indicating a name heading] |
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| 008/11 | c [code indicating MeSH] |
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| 151 | ##$aNew York City | ||||||||
| 751 | #0$aNew York (N.Y.) [Heading from LCSH] |
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