Main entry is chosen following rules in AACR2, Chapter 21. There are no special rules for main entry of computer files.
| 100 2 | Stratton-Porter, Gene, ‡d 1863-1924. |
| 100 1 | Montgomery, L. M. ‡q (Lucy Maud), ‡d 1874-1942. |
| 100 1 | Angelou, Maya. |
| 100 0 | Aristophanes. |
| 110 2 | Fred Hutchinson Cancer Research Center. |
| 110 2 | Library of Congress. |
| 110 1 | Virginia. |
| 110 1 | United States. ‡b Supreme Court. |
| 111 2 | Seminar on Cataloging Digital Documents ‡d (1994 : ‡c University of Virginia Library and Library of Congress) |
| 130 0 | Edward III (Drama) |
| 130 0 | Arabian nights. ‡l English. ‡k Selections. |
| 245 00 | Journal of Buddhist ethics ‡h [computer file] |
| 245 04 | The federal bulletin board ‡h [computer file] |
Serial computer files may need uniform title main entries to distinguish between other serials with the same title, or between other formats or editions of the serial.
| 130 0 | Journal of extension (PostScript ed.) |
| 130 0 | Journal of extension (ASCII ed.) |
| 130 0 | World factbook (Washington, D.C. : Online) |
Added entries are made following AACR2, rules 21.29–21.30. Added entries should be made for names of persons, corporate bodies, and titles not chosen as main entry if those entries might be used by patrons when looking for the item.
Any name or title for which an added entry is made must appear somewhere in the bibliographic record.
| 700 02 | Sophocles. ‡t Oedipus Rex. ‡l English. |
| 700 02 | Sophocles. ‡t Oedipus at Colonus. ‡l English. |
| 700 02 | Sophocles. ‡t Antigone. ‡l English. |
| 700 1 | Tinker, Chauncey Brewster, ‡d 1876-1963. |
| 710 2 | ERIC Clearinghouse on Information & Technology. |
| 710 2 | Cornell Law School. ‡b Legal Information Institute. |
| 710 2 | Federal Information Exchange, Inc. |
| 730 02 | Worm runner's digest. |
Title added entries are indicated variously: field 246 for varying form of title (title for entire work); or field 740 for any title used for a part of the work, uncontrolled analytical titles, and uncontrolled related titles.
| 246 10 | CFS news |
| 246 10 | Chronic fatigue syndrome news |
| 730 02 | Worm runner's digest. |
| 740 02 | Telecommunications relay services for hearing- impaired individuals. |
Field 753 was developed to provide access to the type of computer needed for the computer file being cataloged, as well as for access for additional technical details, such as the programming language used, or the operating system needed. For Internet resources, prefer field 856 for technical information.
Field 856 has been, and continues to be, developed to contain all the information necessary for subscribing to, transferring, or otherwise accessing the electronic resource. The complete description of this field as of this printing is included as appendix A of this document, and the LC guidelines for the use of field 856 are available at < http://lcweb.loc.gov/marc/856guide.html >.
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