Authority 070

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First Indicator Undefined

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Second Indicator Undefined

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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: Control Subfields. $8 - Field link and sequence number See description of this subfield in Appendix A: 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.