| First Indicator Undefined # - Undefined |
Second Indicator Undefined # - Undefined |
| Subfield Codes |
|
| $a - Chronological term (NR) $i - Reference instruction phrase (R) $v - Form subdivision (R) $w - Control subfield (NR) /0 - Special relationship /1 - Tracing use restriction /2 - Earlier form of heading /3 - Reference display |
$x - General subdivision (R) $y - Chronological subdivision (R) $z - Geographic subdivision (R) $5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R) |
Tracing for a chronological term see from reference.
Used in an established heading or established heading and subdivision record to trace a see from reference from a chronological term not used in an established heading.
Most of the content designators defined for field 448 are the same as those defined for field 148 (Heading-Chronological Term), field 548 (See Also From Tracing-Chronological Term), and field 748 (Established Heading Linking Entry-Chronological Term). Description, guidelines, and input conventions for shared content designators are given in the X48 Chronological Terms-General Information section.
Guidelines for applying the subfield $w (Control subfield) and subfield $i (Reference instruction phrase) in field 448 are given in the Tracings and References-General Information section.
| 148 | ##$a1800-1899 | ||||||||
| 448 | ##$aNineteenth century | ||||||||
| 148 | ##$a1900-1999 | ||||||||
| 448 | ##$aTwentieth century | ||||||||
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