====== Authority Control ======

“The procedures by which consistency of form is maintained in the headings (names, uniform titles, series titles, and subjects) used in a library catalog or file of bibliographic records through the application of an authoritative list (called an authority file) to new items as they are added to the collection” [[https://www.abc-clio.com/ODLIS/odlis_about.aspx| Online Dictionary for Library and Information Science]]

Check the OCLC authority files for all controlled fields:

<wrap indent>1xx’s</wrap>\\
<wrap indent>4xx’s</wrap>\\
<wrap indent>6xx’s</wrap>\\
<wrap indent>7xx’s</wrap>\\
<wrap indent>8xx’s</wrap>\\

The OCLC authority file in the Connexion Client can be browsed or searched. To browse the Authority File, use the menu command Authorities>Browse>LC Names and Subjects. Enter the terms for the browse, and select the applicable index. To search the authority file, use the menu command Authorities – Search – LC Names and subjects.

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Search in Command Line:\\

<wrap indent>Topical subject headings: su: or sp: calculus, cooking, etc. </wrap>\\
<wrap indent>Geographical sub heading: gg: Atlanta, ga. </wrap>\\
<wrap indent>Personal name headings: pn: or au: mark twain or twain, mark. </wrap>\\
<wrap indent>Corporate name headings: co or cn: American Library Association</wrap>\\
<wrap indent>Uniform title headings: ti: Oprah's book club</wrap>\\

Search in in Key word/Numeric Search Window by typing terms in the left window and select the correct Index Label provided in the window on the right. The index abbreviation to use in the command line is included in the index name in the Keyword/Numeric Search.

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For more information on navigating the OCLC authority file, click on the help button on the search box (see illustration above), or click on the question mark at the top left of the Connexion client toolbar.

In authority records, authorized access points or headings are in the 1XXs fields. Other fields in the record may provide further information on usage and on distinguishing similar terms or persons.

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^ Authority Tags and the Bibliographic Tags They Control                                            |||
^ Heading                                                 ^ Authority Tag  ^ Bibliographic Tags       ^
| Personal Name                                           | 100            | 100, 600, 700, 800       |
| Corporate Name                                          | 110            | 110, 610, 710, 810       |
| Conference Name                                         | 111            | 111, 611, 711, 811       |
| Uniform Title                                           | 130            | 130, 440, 630, 730, 830  |
| Chronological Term                                      | 148            | 648                      |
| Topical Subject                                         | 150            | 650                      |
| Geographic Subject                                      | 151            | 651                      |
| Genre / Form Subject                                    | 155            | 655                      |
| Topical Subdivision                                     | 180            | 6xx ǂx                   |
| Geographic Subdivision                                  | 181            | 6xx ǂz                   |
| Chronological Subdivision                               | 182            | 6xx ǂy                   |
| Form Subdivision                                        | 185            | 6xx ǂv                   |


More information about authority data can be found at [[http://www.loc.gov/marc/authority/|MARC 21 Authority Data]]