Authority 070 szerkesztése

<p align="right">[[Kezdőlap]] - [[A MARC21 authority formátum]] - [[Authority 01X-09X]]</p>

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== First Indicator ==

:''Undefined''
:'#' - Undefined

	
== Second Indicator ==

:''Undefined''
:'#' - Undefined

	

== Subfield Codes ==

:$a - Classification number (NR)
:$b - Item number (NR)
:$d - Volumes/dates to which call number applies (NR)
:$6 - Linkage (NR)
:$8 - Field link and sequence number (R)

== FIELD DEFINITION AND SCOPE ==


:Call number assigned by the National Agricultural Library (NAL) to a series when all or part of the series is classified as a collected set or with the main series (646, Series Classification Practice, subfield $a, code c or m).

:Used only for class numbers and call numbers assigned by NAL. May also contain NAL accession numbers for visual materials.

:May also contain the volumes/dates to which the number applies. Varying numbers for different ranges of volumes/dates within a series are contained in separate 070 fields.

:Prior to 1965, NAL used a USDA library classification scheme. In 1965, NAL began using the ''Library of Congress Classification'' for all newly-cataloged materials. Both schemes are still used because some series title changes have been kept with the USDA scheme call number.

== GUIDELINES FOR APPLYING CONTENT DESIGNATORS ==

:'''INDICATORS'''

::Both indicator positions are undefined; each contains a blank (#).

:'''SUBFIELD CODES'''

::'''$a - Classification number'''
									
::::'''070''' 	##$a99.8$bF76322
:::::''[Number assigned from the USDA library scheme]''

::'''$b - Item number'''
									
::::'''070''' 	##$aQH545.A$bT6
:::::''[Number assigned from the LC classification scheme]''

::'''$d - Volumes/dates to which call number applies'''
:::Statement used only when the call number does not apply to all items of the series. Applies to: may be generated for display.
:::May also contain a copy (or set) number.

::'''$6 - Linkage'''
:::See description of this subfield in Appendix A: [http://www.loc.gov/marc/authority/ecadcntf.html Control Subfields].

::'''$8 - Field link and sequence number'''
:::See description of this subfield in Appendix A: [http://www.loc.gov/marc/authority/ecadcntf.html Control Subfields].

== INPUT CONVENTIONS ==

:'''Order''' - The 070 field for a current call number precedes the 070 field for an earlier call number.
:'''Capitalization''' - Alphabetic characters in the classification portion of the field are usually uppercase.


<p align="right">[[Kezdőlap]] - [[A MARC21 authority formátum]] - [[Authority 01X-09X]]</p>