|First Indicator||Second Indicator|
|830 - Undefined
# - Undefined
130/630/730 - Nonfiling characters
0 - No nonfiling characters
1-9 - Number of nonfiling characters
|130 - Undefined
# - Undefined
630 - Thesaurus
0 - Library of Congress Subject Headings
1 - LC subject headings for children's literature
2 - Medical Subject Headings
3 - National Agricultural Library subject authority file
4 - Source not specified
5 - Canadian Subject Headings
6 - Répertoire de vedettes-matière
7 - Source specified in subfield $2
730 - Type of added entry
# - No information provided
2 - Analytical entry
830 - Nonfiling characters
0-9 - Number of nonfiling characters
Subject subdivision portion
Subelements occurring in uniform or conventional title, title page title, or series title headings that are not entered under a name in a name/title heading and that are constructed according to the generally accepted cataloging and thesaurus-building rules (e.g., Anglo-American Cataloguing Rules (AACR 2), Library of Congress Subject Headings (LCSH)). A uniform title heading is used to bring together bibliographic entries for a work when various issues have appeared under different titles and to provide identification for a work when the title by which it is known differs from the title proper of a particular issue or when different publications have identical titles. A uniform title entered under a name is contained in field 240 or in subfield $t (Title of a work) in the field appropriate for the author's name (X00, X10, X11). Uniform titles used in phrase subject headings (e.g., Bible in atheism) are contained in field 650 (Subject Added Entry-Topical Term).
There is no field 430 which corresponds to fields 130, 630, 730, and 830. See the description of field 490 for series statements consisting only of titles.
Guidelines for applying all content designators except the second indicator position are given in this section. A field-specific list of content designators and guidelines for applying the second indicator position are provided under the description for each specific X30 field.
First Indicator - Undefined 
Undefined and contains a blank (#).
First Indicator - Nonfiling characters [130/630/730]
Value that specifies the number of character positions associated with a definite or indefinite article (e.g., Le, An) at the beginning of a uniform title field that are disregarded in sorting and filing processes.
No initial article character positions are disregarded. Diacritical marks or special characters at the beginning of a uniform title field that does not begin with an initial article are not counted as nonfiling characters.
|130||0#$a"Hsüan lai hsi kan" hsi lieh.|
Initial definite or indefinite article may also simply be deleted in the formulation of the uniform title field. If the initial article is retained but is not to be disregarded in sorting and filing processes, value 0 is used.
|130||0#$aLos Angeles times.|
Title begins with a definite or indefinite article that is disregarded in sorting and filing processes. Any diacritical mark, space or mark of punctuation associated with the article and any space or mark of punctuation preceding the first filing character after the article is included in the count of nonfiling characters. Any diacritic, however, associated with the first filing character is not included in the count of nonfiling characters.
Second indicator position is unique to the function of the uniform title field. It is described under the following fields: 130 (Main Entry-Uniform Title); 630 (Subject Added Entry-Uniform Title); 730 (Added Entry-Uniform Title); and 830 (Series Added Entry-Uniform Title).
$a - Uniform title
Parenthetical information added to make a title distinctive is not separately subfield coded except in the case of the date of signing added to a uniform title of a treaty (see description of subfield $d).
|630||00$aDead Sea scrolls.|
|730||0#$aNew York times.|
|130||0#$aSiège d'Orléans (Mystery play)|
|830||#0$aMarch of time.|
|730||0#$a60 minutes (Television program)|
|830||#0$aResources information series.|
|630||00$aFour seasons (Motion picture : 1981)|
|130||0#$aDialogue (Montréal, Québec : 1962).$lEnglish.|
of Reciprocal Assistance$d(1947)
[Parenthetical date of treaty signing is contained in subfield $d.]
$d - Date of treaty signing
Date of signing used in a uniform title field for a treaty or other intergovernmental agreement.
|630||00$aTreaty of Utrecht$d(1713)|
$e - Relator term 
Designation of a relationship between a uniform title and the described materials, e.g., depicted.
$f - Date of a work
Date of publication used in a uniform title field.
Date added parenthetically to distinguish between identical uniform titles is not separately subfield coded.
|130||0#$aKing Kong (1933)|
|130||0#$aKing Kong (1976)|
$g - Miscellaneous information
Data element that is not more appropriately contained in another defined subfield.
|130||0#$aBible.$gManuscripts, Latin.$pN.T.$pGospels (Lindisfarne gospels)|
$h - Medium
Media qualifier used in a uniform title field.
|130||0#$aGone with the wind (Motion picture).$hSound recording.|
$i - Relationship information 
Designation of a relationship between the resource described in the 7XX field and the resource described in the 1XX/245 of the record. This may be an uncontrolled textual phrase or a controlled textual value from a list of relationships between bibliographic resources.
$k - Form subheading
Form subheading used in a uniform title field. Form subheadings used with uniform titles include Manuscript, Protocols, etc. and Selections.
|130||0#$aBible.$pO.T.$pFive Scrolls.$lHebrew.$sBiblioteca apostolica vaticana.$kManuscript.$nUrbiniti Hebraicus 1.|
|130||0#$aConvention for the Protection of Human Rights and Fundamental Freedoms$d(1950).$kProtocols, etc.,$d1963 Sept. 16.|
|130||0#$aPortrait and biographical album of Isabella County, Mich.$kSelections.|
|130||0#$aVedas.$pRgveda.$lItalian & Sanskrit.$kSelections.|
$l - Language of a work
Name of the language(s) (or a term representing the language, e.g., Polyglot) used in a uniform title field.
|130||0#$aKhimiíà i tekhnologiíà vody.$lEnglish.|
|730||02$aTreaty on the Non-proliferation of Nuclear Weapons$d(1968).$lSpanish.$f1977.|
$m - Medium of performance for music
Term(s) designating the medium of performance used in a uniform title field. If the uniform title includes as part of the medium the abbreviation “acc.” or “unacc.,” the abbreviation is recorded in subfield $m. The abbreviation, “unacc.” is recorded in subfield $a when it is not an addition to a statement of medium. When a phrase such as “pianos (2),” “4 hands,” etc., follows a collective uniform title for a specific medium of performance, it is included in subfield $a.
|130||0#$aDuets,$mviolin, viola,$nop. 10.$nNo. 3.
[Uniform title heading for a work of unknown authorship.]
$n - Number of part/section of a work
Number designation for a part/section of a work used in a uniform title field.
In music uniform titles, the serial, opus, or thematic index number, or a date used to distinguish one work from another, is contained in subfield $n.
Multiple alternative numberings (often separated by a comma) are contained in a single subfield $n. Multiple numberings that are hierarchical (often separated by a period) are contained in separate occurrences of subfield $n.
|730||0#$aSouthern reporter.$nSecond series.|
van Stellenbosch.$nSerie A2,$pSöologie.
[Part/section is both numbered and named.]
|730||0#$aEconomics library selections.$nSeries I,$pNew books in economics.|
$o - Arranged statement for music
Abbreviation arr. used in a uniform title field.
|730||02$aGod save the king;$oarr.$f1982.|
$p - Name of part/section of a work
Name designation of a part/section of a work used in a uniform title field.
|130||0#$aStatistics of income.$pPartnership returns (1977)|
|130||0#$aStatistical bulletin (Bamako, Mali).$pSupplement.|
|730||02$aAmerican Convention on Human Rights$d(1969).$nPart 2,$pMeans of Protection.$lSpanish.$f1979.|
Named part that indicates a subpart to the first noted part/section is contained in a separate subfield $p.
$r - Key for music
Statement of key in which the music is written used in a uniform title field.
|130||0#$aConcertos,$mviolin, string orchestra,$rD major.|
$s - Version
Version, edition, etc., information used in a uniform title field.
$t - Title of a work
Title page title of a work. Subfield $t is unlikely to be used in an X30 field.
$v - Volume/sequential designation 
Volume number or other sequential designation used in an 830 series added entry.
|830||#0$aSerie Mariano Azvela ;$v2.|
$v - Form subdivision 
Form subdivision that designates a specific kind or genre of material as defined by the thesaurus being used. Subfield $v is appropriate only when a form subject subdivision is added to a uniform title heading to form an extended subject heading. Subfield $v is used for form terms when they function as indicated above. Subfield $x may be used if the terms function as general subdivisions. A form subdivision in subfield $v is generally the last subfield in the field. The subfield may be repeated if more than one form subdivision is used.
|630||00$aNew York times$vIndexes.|
|630||00$aTriple Alliance, 1882$vCaricatures and cartoons.|
$w - Bibliographic record control number 
$x - International Standard Serial Number [730/830]
ISSN for a serial title given in the title portion of a uniform title field. The ISSN is an agency-assigned data element. ISSNs are assigned to serial publications by national centers under the auspices of the ISSN Network.
$x - General subdivision 
Subject subdivision that is not more appropriately contained in subfield $v (Form subdivision), subfield $y (Chronological subdivision), or subfield $z (Geographic subdivision). Subfield $x is appropriate only when a general topical subdivision is added to a uniform title.
$y - Chronological subdivision 
Subject subdivision that represents a period of time. Subfield $y is appropriate only when a chronological subject subdivision is added to a uniform title.
|630||00$aKoran$xCriticism, interpretation, etc.$xHistory$y19th century.|
|630||00$aBerliner Revue$xHistory$y20th century.|
$z - Geographic subdivision 
Appropriate only when a geographic subject subdivision is added to a uniform title.
|630||00$aBible$xStudy and teaching$zGermany$xHistory$y20th century.|
$0 - Authority record control number or standard number
$2 - Source of heading or term 
MARC code that identifies the source list from which the heading in a 630 subject added entry field was assigned. It is used only when the second indicator position contains value 7 (Source specified in subfield $2). Code from: Subject Heading and Term Source Codes.
$3 - Materials specified [630/730/830]
Part of the described materials to which the field applies.
$4 - Relator code 
MARC code that specifies the relationship between a uniform title and the described materials. Code from: MARC Code List for Relators.
$5 - Institution to which field applies [730/830]
$6 - Linkage
$7 - Control subfield 
Up to two character positions (designated 0 and 1) that indicate special characteristics of the linked entry. Because the definitions of the codes in subfield $7 are dependent on the character position in which they occur, the coding of any character position mandates that each preceding character position contains a code or the fill character (|); succeeding character positions need not be used.
Code indicating the type of record for the related item. The code is the same as the code in Leader/06 (Type of record) in the record for the related item.
|d||Manuscript notated music|
|f||Manuscript cartographic material|
|i||Nonmusical sound recording|
|j||Musical sound recording|
|k||Two-dimensional nonprojectable graphic|
|r||Three-dimensional artifact or naturally occurring object|
|t||Manuscript language material|
Code indicating the bibliographic level of the related item. The code is the same as that in Leader/07 (Bibliographic level) in the record for the related item.
|a||Monographic component part|
|b||Serial component part|
$8 - Field link and sequence number
Ambiguous Headings - See Appendix E: Ambiguous Headings.
Punctuation - Punctuation of the subelements of a heading is generally dictated by descriptive cataloging or subject heading system/thesaurus rules. These input conventions clarify MARC punctuation practices. Fields 130, 630, 730, and 830 end with a mark of punctuation or a closing parenthesis. If the final subfields are subfield $0, $2, $3, or $5, the mark of punctuation or closing parenthesis precedes those subfields.
|130||0#$aTen commandments.$lEnglish & Hebrew.|
|730||02$aGod save the king;$oarr.$f1982.|
|630||00$aTalmud$vGlossaries, vocabularies, etc.$5ICU|
|830||#0$aPublicación miscelánea (Inter-American Institute for Cooperation on Agriculture) ;$vno. 391.|
Mark of punctuation is placed inside a closing quotation mark.
|830||#0$aPublicaciones del Archivo Histórico de la Provincia de Buenos Aires "Ricardo|
Uniform title heading followed by a subject subdivision does not end with a mark of punctuation unless the title ends with an abbreviation or an initialism.
|630||00$aUnited Nations Convention on Contracts for the International Sale of Goods$d(1980)$vCongresses.|
|630||00$aBook of Mormon$xAntiquities.|
|630||00$aBible.$pN.T.$xCriticism, interpretation, etc.|
Spacing - No spaces are used in initialisms.
|830||#0$aSpecial publication of the IEEE Power Engineering Society ;$vno. 19.|
One space is used between preceding and succeeding initials if an abbreviation consists of more than a single letter.
|830||#0$aMineral resources series (Morgantown, W. Va.) ;$vMRS-7B.|
Initial Articles - Initial articles (e.g., The) occurring at the beginning of uniform title heading fields are usually omitted in most languages (except when the intent is to file on the article).
|730||0#$aLos Angeles times.|
Any diacritics and/or special characters occurring at the beginning of field are retained. Note that such characters are usually ignored for purposes of sorting and filing.
Values were: 0 (Main entry/subject relationship irrelevant), 1 (Main entry is subject).
In 2014, subfield $g was made repeatable.
In 1979, subfield $n was defined for numbers of parts/sections and subfield $p (Part) was redefined to include only names of parts/sections. Prior to that change, both the number and the name of a part were contained in one subfield $p.