OCLC WorldCat Dissertations and Theses (WorldCatDissertations)

OCLC catalog of dissertations and theses available in OCLC member libraries

Why select this database?

This database provides fast and convenient access to the dissertations and theses available in OCLC member libraries. Many of these are available electronically, at no charge, directly from the publishing institution.

Database details

All dissertations, theses and published material based on theses cataloged by OCLC members, including all subjects.

Sources OCLC member libraries
Number of records Over 8 million records in the database
Dates covered All cataloged dissertations, theses and published material based on theses and dissertations to the present.
Updated Daily
Producer information

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Index labels and examples of an expert search in WorldCat Dissertations and Theses

Use a colon after an index label (for example, au:) when you are not certain of your search terms. Use an equal sign after an index label (au=) for an exact match search. You can search with an index label from any search screen. The information you type overrides any default menu selections. The following examples show sample rather than actual searches.

Search indexes Labels Examples
Keyword kw: coffee or tea and house+

[keyword searches, publication year, ISBN, geographic codes, map data, and all the information found in the Author, Title, Notes, Publisher, Publisher location, and Subject indexes]
Access Method am: www oclc org [or] oclc

(omit http:, and use spaces instead of punctuation or special characters)
Accession Number no: 4620335

Author au: saint-arroman

(use single quotes around 'le' and other words that are operators;

operators supported in FirstSearch: Boolean search operators, parentheses, proximity operators, wildcards; operators included are le, ge, it, gt, n, near, w, with, and, or, not)
Author Phrase au= saint-arroman auguste

(use double quotes around exact phrases; omit single quote from 'le' operator when the double quote is used to search for an exact phrase)
Corporate and Conference Name cn: canadian
Corporate and Conference Name Phrase cn= canadian acoustics week
Descriptor de: voice disorders
Descriptor Phrase de= voice disorders in children
Genre/Form ge: solo piano
Genre/Form Phrase ge= screenplays
Geographic Coverage gc: cape
Geographic Coverage Phrase gc= capetown
ISBN nb: 3196311821 or 31-9631-182-1

9783540287070 or 978-3-540287-07-0

(search with or without hyphens)
ISSN ns: 0000-0019

(use hyphens)
Language Phrase ln= kw:coffeehouse* and ln= japanese

(See the drop-down list under Limit to: Language for the complete list of languages.)
Library of Congress Call No. lc: hd9000.6

(index deletes and collapses all spaces and punctuation, except periods)
LC Control Number nl: ne64-2560 or ne64002560 or ne642560 or

64-2560 or 64002560 or 642560

(prefixes can be immediately connected to the number or removed; hyphens can be included or removed; the number is searchable as it is stored, with the year and then six digits with leading zeros for unused digits, or as it is often displayed, without zeros)
Material Type mt: vhs
Material Type Phrase mt= vhs tape
Musical Composition mc: jazz
Musical Composition Phrase mc= folk music
Named Corporation and Conference nc: world conference on women
Named Corporation and Conference Phrase nc= intel corporation
Named Person na: mandela
Named Person Phrase na= mandela, nelson

(last name first with first comma retained)
Notes/Comments (includes degree-granting institution) nt: erasmus universiteit rotterdam
Personal Name pn: lemaire
Personal Name Phrase pn= weijer, kees

(use last name first with or without the first comma retained)
Publisher pb: media
Publisher Phrase pb= new star media inc
Publisher Location pl: china
Series Title se: emb report
Series Title Phrase se= emb evaluation report
Standard Number sn: 1097461x or 1097-461x

9783540287070 or 978-3-540287-07-0

1550463160 or 155-0463-160


(for all searches, hyphens can be included in the search or removed; for the LCCN number, only the number used for storage, with the year and then six digits with leading zeros for unused digits, is indexed; many other standard numbers are included in this index)
Subject su: coffee and tea house+
Subject Phrase su= coffeehouses in art
Subject All sa= medical fees canada

(phrase search of complete subject heading with all parts, so "medical fees--canada" is searched as a single phrase)
Title ti: music w3 british w3 enlightenment
Title Phrase ti= music theory in the british isles during the enlightenment
Uniform title ut: bible
Uniform Title Phrase ut= selected poems 1930-1972
Update Date up: 20060101

Refine your results by adding these labels to your search terms:

Refine by Label Example
DLC restrictor dl: ti: anything and dl:y
Document type¹ bks (books) mix (mixed material) dt= (history and dt=map)
com (computer) rec (recordings)
map (maps) sco (scores)
vis (visual media) ser (serials)
url (internet resource) art (articles)
int (continually updated resource)  
Language² ln= ln=spa or ln=spanish
Library holdings³ li= li=ocl
Material type 4 mt: or mt= history and mt=juvenile

history and mt=microform
Number of libraries 5 cg: history and cg:31-
Year(s) of publication yr: yr:1996-1998

¹ Use these limits only in combination with another search statement.

² Valid values for the language limiter include both the MARC three-letter language code and the english spelling of a language. For example, Spanish can be searched using ln=spa or ln=spanish.

³ For a list of library symbols, visit the Participating Institutions List Web site

4 A number of specific searches are available with the material type index can make an excellent method for limiting records. For a complete list of material type indexes see Material types.

5 For a complete list of codes for the Number of Libraries index, see Number of library holdings.