The extent of the item. In records formulated according to ISBD principles, subfield ǂa includes all data up to and including the next mark of ISBD punctuation, e.g., a colon, a semicolon, or a plus sign, whether included or not.

For books, use subfield ǂa for the number of pages and/or number of volumes.

Enter combined statements of pagination and illustrative matter in subfield ǂa.

For archival materials and manuscripts, use subfield ǂa for the number of leaves, pages, items, containers, volumes, or linear feet. If you separately code the type of unit in subfield ǂf, subfield ǂa contains only the numeric extent designation.

For continuing resources, use subfield ǂa for the number of physical units.

Enter the appropriate term from the list of carrier types. Precede the carrier by the number of physical units in Arabic numerals for publications that are complete. See RDA 3.4.1.3 and RDA 3.3.1.3. For AACR2, see rule 12.5B1.

For cartographic materials, use subfield ǂa for the number of physical units.

Enter the appropriate term from the list of carrier types preceded by the number of physical units in Arabic numerals. See RDA 3.4.2.2. For AACR2, see rule 3.5B1.

For computer files, use subfield ǂa for the number of physical units.

Enter the appropriate term from the list of carrier types preceded by the number of physical units in Arabic numerals. See RDA 3.4.1.3 and RDA 3.3.1.3. For AACR2, see rule 9.5B1.

For scores, use subfield ǂa for the number of physical units.

Enter the appropriate term from the list of carrier types preceded by the number of physical units in Arabic numerals. See RDA 3.4.3.2 and RDA 7.20.1.3. For AACR2, see rule 5.5B1. Do not repeat subfield ǂa if you are entering multiple adjacent phrases. Enter multiple adjacent phrases in the same subfield ǂa. However, repeat subfield ǂa if you are cataloging scores and parts that are not adjacent because subfield ǂb or subfield ǂc separate it from the main extent data.

Enter the pagination or number of volumes in parentheses following the carrier type. If you are cataloging different types of scores and/or parts in a single physical unit, record the extent in the form: 1 score and 4 parts, etc., followed by the number of pages, leaves, or columns, in parentheses. See RDA 3.4.3.2.

For sound recordings, use subfield ǂa for the number of physical units.

Enter the appropriate term from the list of carrier types preceded by the number of physical units in Arabic numerals. See RDA 3.4.1.3 and RDA 3.3.1.3. For AACR2, see rule 6.5B1.

Enter the playing time in parentheses following the carrier type when appropriate. See RDA 7.22.1.3, RDA B.5.3, and RDA B.7.

For visual materials, use subfield ǂa for the number of physical units.

Enter the appropriate term from the list of carrier types preceded by the number of physical units in Arabic numerals. See RDA 3.3.1.3.

For motion pictures and videorecordings, enter the playing time or number of frames in parentheses following the carrier type. See RDA 7.22.1.3, RDA B.5.3, and RDA B.7. For AACR2, see rule 7.5B1.

For graphic materials, enter the number of frames, sheets, or overlays in parentheses following the carrier type. See RDA 3.4.1.7. For AACR2, see rule 8.5B1.

For three-dimensional artifacts and realia, enter the number and the type(s) of the component pieces in parentheses following the carrier type. See RDA 3.4.6.3. For AACR2, see rule 10.5B1.

You may repeat field 300 to describe different parts of multipart items.

For multipart items that are not yet complete, enter the appropriate term for the carrier without the number. See RDA 3.4.1.10.

Further characteristics of an item. In records formulated according to ISBD principles, subfield ǂb includes all data following a colon and up to and including the next mark of ISBD punctuation, e.g., a semicolon or a plus sign, whether included or not.

For books, use subfield ǂb for any illustrative matter.

Use field 500 to note illustrations on lining papers.

For archival materials and manuscripts, use subfield ǂb for the material on which a single manuscript is written (except when that material is paper) and also for illustrative matter in the manuscript or the manuscript collection.

For cartographic materials, use subfield ǂb for the number of maps in an atlas, color characteristics, composition of material, and mounting.

For computer files, use subfield ǂb for the sound and/or display encoding, the number of sides used, the recording density, and the sectoring.

For microforms, enter the polarity information in subfield ǂb. See RDA 3.14.1.3.

For scores, use subfield ǂb for any illustrative matter.

Enter illustration statements following the score or part to which it pertains.

For sound recordings, prefer use of field 344 for recording sound characteristics such as the type of recording, the playing speed, the groove characteristic, the track configuration, the number of tracks and sound channels, and the recording and reproduction characteristics. See RDA 3.16.1.3-RDA 3.16.9.3 and Best Practices for Music Cataloging.

For visual materials, use subfield ǂb for the other physical details appropriate to the material.

For motion pictures and videorecordings, enter the aspect ratio and special projection characteristics, sound characteristics, color characteristics, and projection speed.

For graphic materials, enter medium-specific details and color characteristics

For three-dimensional artifacts and realia, enter the composition of material and color characteristics.

For print continuing resources, use subfield ǂb for any illustrative matter.

The dimensions of an item. In records formulated according to ISBD principles, subfield ǂc includes all data following a semicolon and up to and including the next mark of ISBD punctuation, e.g., a plus sign, whether included or not. Enter a space on each side of the lowercase x used to represent the multiplication sign that separates height, width, and depth when appropriate.

If you enter a range of heights in subfield ǂc, do not enter spaces before or after the hyphen.

For books, use subfield ǂc for the size of the item.

For archival materials and manuscripts, use subfield ǂc for the size of the manuscript, item, container, or volume.

For cartographic materials, use subfield ǂc for the size of the item.

For computer files, use subfield ǂc for the size of the item.

For scores, do not repeat subfield ǂc when dimensions are given as part of the description of accompanying material. However, repeat subfield ǂc when dimensions are associated with a repeated subfield ǂa. Also, if the dimensions of the score or parts differ, enter each dimension in a separate subfield ǂc following the score or part to which it pertains.

For sound recordings, use subfield ǂc for the size of the item.

For visual materials, use subfield ǂc for the size of the item.

For print continuing resources, use subfield ǂc for the size of the item. For non-print continuing resources, use subfield ǂc for the dimensions appropriate to the type of material.

A description of the accompanying material. In records formulated according to ISBD principles, subfield ǂe includes all data following a plus sign, whether included or not. Prefer use of subfield ǂe to record accompanying material. Include any physical description statements associated with accompanying material without further subfielding.

The type of unit (e.g., box, cubic feet, linear feet, page, or volume) to which the extent of an item relates. Use to identify the configuration of material and how it is stored. Use for archival and rare materials only.

Repeat subfield ǂf when alternate or additional forms of extent data are given. Record alternate forms of extent data in parentheses.

The size of the type of unit recorded in the preceding subfield ǂf. Use for archival and rare materials only.

Repeat subfield ǂg when additional forms of extent data are given.

For information about subfield ǂ3, see Control Subfields.

Data that link fields when non-Latin script is entered. This subfield is system supplied and does not appear in OCLC online displays. Do not manually add subfield ǂ6. For more information about subfield ǂ6, see Control Subfields.

For information about subfield ǂ7, see the Data Provenance Subfields section of Control Subfields.

For information about subfield ǂ8, see Control Subfields.