685 - History Note (R)
MARC 21 Classification - Concise
2008
Information about the history of the use and meaning of a classification number that is
contained either in field 153 (Classification Number) unless a 453 (Invalid Number
Tracing) or 553 (Valid Number Tracing) field contains code a (History reference, field
685 used) in control subfield $w/3 (History reference).
Indicators
First - Result of change
0 - Completely new number
1 - Completely vacated number
2 - Partially changed number
3 - Reused after being vacated
4 - Immediately reused
8 - Other
Second - Type of history information
0 - Relocation
1 - Formerly
2 - Discontinuation
3 - Expansion
8 - Other
Subfield Codes
$a - New number-single number or beginning number of span (R)
Used to amplify the explanatory text of the note.
$b - Previous number-single number or beginning number of span (R)
Old number from which the topic has been moved. If the old number is the same as
the number in field 153, 453, or 553, this subfield is not used.
$c - Classification number-ending number of span (R)
$d - Date of implementation at authoritative agency (NR)
$e - Local implementation date (NR)
$f - Title and publication date (NR)
Code or a title and publication date string that identifies the source where the
classification number change first appeared if the change occurred in other than a
published edition identified in subfield $2 (Edition number). The field
may also contain a volume and number if appropriate, following the title and
publication date or coded data.
$i - Explanatory text (R)
Explains the scope of the classification number. This subfield is repeated when
other subfields intervene in the explanatory text.
$t - Topic (R)
Topic that is being added to or subtracted from the meaning of the number in field
153, 453, or 553 of this or another record.
$y - Table sequence number for internal subarrangement or add table (R)
$z - Table identification (R)
$2 - Edition number (R)
$5 - Institution to which field applies (R)
$8 - Field link and sequence number (NR)
Examples
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| 685 |
01$tMultimedia systems, interactive video, comprehensive
works on computer graphics and computer sound synthesis$iall formerly located in$a006.6$d19960930$221
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| 685 |
12$iProvision discontinued because without meaning in
context$d19960930$221 |
| 685 |
22$iUse of this number for$tcooperation$idiscontinued; class in$a158$d19960930$221 |
| 685 |
10$tCritical appraisal of a person's work$irelocated to$z1$a092$d19650501$217
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| 685 |
31$tMen$iformerly located in$z1$b088041$d19890306$220 |
| 685 |
41$tYiddish$iformerly located in$b437.947$d19960930$221
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| 685 |
42$iUse of this number for$tcomprehensive works on Old Low Germanic languages$idiscontinued; class in$a439$d19960930$221
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| 685 |
40$tOld Frisian$irelocated to$a439.2$d19960930$221
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| 685 |
88$iThis schedule is extensively revised, 370.1, 370.7,
375-377, and 378.14-378.19 in particular departing from earlier editions.
A comparative table giving both old and new numbers for relocated topics,
and equivalence tables showing the numbers in the old and new schedules
appear in volume 1 of this edition$d19960930$221
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| 685 |
03$iExpanded from$a796.324$tNetball$d19960930$221
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| 685 |
88$iExcept for military science (355-359), this schedule
is new and has been prepared with little or no reference to previous
editions. Most numbers have been reused with new meanings. A comparative
table giving both old and new numbers for a substantial list of topics
and equivalence tables showing the numbers in the old and new schedules
appear in volume 1 of this edition$d19960930$221
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| 685 |
01$tData processing. Computer science$iformerly located in$b001.6$d19850501$fDDC 004-006, data processing and computer science and
changes in related disciplines, 1985$219
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| 685 |
03$tSocialization by the family$d19820315$fDDC 301-307, sociology, 1982$219
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| 685 |
01$tQuantum electrodynamics$iformerly located in$b537.67$d19990901$fNew and Changed Entries, September 1999$221
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| 685 |
20$tPopulation size and composition$irelocated to$a304.6$d19960930$221
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| 685 |
01$tHainan Province (Hainan Sheng)$iformerly located in$z2$b5127$d19910501$220
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