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) <n> 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 i Three times a week b Bimonthly j Three times a month c Semiweekly m Monthly d Daily q Quarterly e Biweekly s Semimonthly f Semiannual t Three times a year g Biennial w Weekly h Triennial x Completely irregular $x Calendar change (NR) Month Day Season 01-02 Month 01-31 Day 21 Spring 23 Autumn 22 Summer 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 Season Day of month mo Monday 21 Spring 01-31 tu Tuesday 22 Summer we Wednesday 23 Autumn th Thursday 24 Winter fr Friday sa Saturday su Sunday Week of month Week Month 99 Last 01-53 01-12 98 Next to Last 97 Third to Last 00 Ever 01 First 02 Second 03 Third 04 Fourth 05 Fifth $z Numbering scheme (R) $3 Materials specified (NR) $8 Link and sequence number (NR)