Subfield $a of 730 is defined as Uniform title and subfield $t as Title of a work: http://www.loc.gov/marc/bibliographic/bd730.html

The X30 of the MARC 21 Bibliographic Format (http://www.loc.gov/marc/bibliographic/bdx30.html) also makes the same distinction:

$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#$aSige d'Orlans (Mystery play)
830 #0$aMarch of time.
130 0#$aBeowulf.
730 0#$a60 minutes (Television program)
830 #0$aResources information series.
830 #0$aImago (Series)
630 00$aFour seasons (Motion picture : 1981)
130 0#$aDialogue (Montral, Qubec : 1962).$lEnglish.
630 00$aInter-American Treaty of Reciprocal Assistance$d(1947)
     [Parenthetical date of treaty signing is contained in subfield $d.]

$t - Title of a work
Title page title of a work. Subfield $t is unlikely to be used in an X30 field.


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Adam L. Schiff
Principal Cataloger
University of Washington Libraries
Box 352900
Seattle, WA 98195-2900
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(206) 685-8782 fax
asch...@u.washington.edu
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On Tue, 19 Apr 2011, Gene Fieg wrote:

In appendix E, I think, 730  is listed with its subfields.  One of those 
subfields is |t.
Is that possible to have a title of title??

--
Gene Fieg
Cataloger/Serials Librarian
Claremont School of Theology
gf...@cst.edu

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