853 CAPTIONS AND PATTERN--BASIC BIBLIOGRAPHIC UNIT (R)
Indicators First Compressability and expandability 0 Cannot compress or expand 1 Can compress but not expand 2 Can compress or expand 3 Unknown Second Caption evaluation 0 Captions verified; all levels present 1 Captions verified; all levels may not be present 2 Captions unverified; all levels present 3 Captions unverified; all levels may not be present
Subfield Codes $a First level of enumeration (NR) $b Second level of enumeration (NR) $c Third level of enumeration (NR) $d Fourth level of enumeration (NR) $e Fifth level of enumeration (NR) $f Sixth level of enumeration (NR) $g Alternative numbering scheme, first level of enumeration (NR) $h Alternative numbering scheme, second level of enumeration (NR) $i First level of chronology (NR) $j Second level of chronology (NR) $k Third level of chronology (NR) $l Fourth level of chronology (NR) $m Alternative numbering scheme, chronology (NR) $t Copy (NR) $u Bibliographic units per next higher level (R) Number of parts var Varies und Undetermined $v Numbering continuity (R) c Number increments continuously r Numbering restarts at the completion of the unit $w Frequency (NR) a Annual b Bimonthly c Semiweekly d Daily e Biweekly f Semiannual g Biennial h Triennial j Three times a month m Monthly q Quarterly s Semimonthly t Three times a year w Weekly $x Calendar change (NR) Month 01-12 Day 01-31 Season 21 Spring 22 Summer 23 Autumn 24 Winter $y Regularity pattern (NR) Publication code o Omitted p Published Chronology code definition d Day m Month s Season w Week Chronology Code Day of week mo Monday tu Tuesday we Wednesday th Thursday fr Friday sa Saturday su Sunday Season 21 Spring 22 Summer 23 Autumn 24 Winter Day of month 01-31 Week of month 99 Last 98 Next to Last 97 Third to Last 00 Ever 01 First 02 Second 03 Third 04 Fourth 05 Fifth Week 01-53 Month 01-12 $3 Materials specified (NR) $8 Link and sequence number (NR)