| Field | Description | Required | Format |
| 300 | Physical Description | Required | All |
| 310 | Current Publication Frequency | Required | Serials |
| 336 | Content Type | Required | All |
| 337 | Media Type | Required | All |
| 338 | Carrier Type | Required | All |
| 340 | Physical Medium | Required | Large Print |
| 362 | Dates of Publication and/or Sequential Designation | Required | Serials |
300 Field
Do not combine varying formats under a single term when separate terms are more clear. For example, a Blu-ray/DVD combo pack should be represented with the Blu-ray disc and DVD separate. Instead of "2 videodiscs", use:
300 1 Blu-ray disc (120 minutes) :|b sound color ;|c 4 3/4 in. +|e 1 videodisc (DVD).
Pagination in subfield 'a' should reflect what appears on the source, including the pages with Roman numerals. Special compilations, graphic novels, etc., may include a variety of paginations that correspond to specific comic panels, or stories within the same volume, thus making it difficult to accurately represent the number of pages.
In cases of ambiguity and to prevent misinformation and duplicate records, there are different ways to add the information to subfield 'a'. Remember that including a 500 explanatory note is very helpful.
Example 1:
300 1 volume (various pagings) :|bchiefly color illustrations ;|c22 cm 500 Pagination corresponds to specific comic panels. Some pages include multiple numbered panels.
Example 2:
300 250 pages in various pagings :|billustrations,|c25 cm
300 field subfield 'b' and its correlation to the 344 and 347 tags
Subfield 'b' is optional for AUDIOBOOKs and CDs only if the record contains pertaining information about the sound and digital file characteristics in the 344 and 347 respectively.
For AUDIOBOOK and CD records missing subfield 'b' in the 300 tag, the following information is required:
344 digital |2rdatr 344 |boptical |2rdarm 344 |c1.4 m/s 347 audio file |2rdaft 347 |bCD audio
310 - Field
Serials records must have the 310 field containing the current publication frequency.
336, 337, and 338 Fields
These tags represent how a work is expressed, and there has been a proliferation of OCLC records missing subfield 'b'. Subfield 'b' is the code for the term in subfield 'a' and it works in conjunction with the fixed field to determine the record format.
Include subfields |a, |b, and |2 in all cases, except in the cases of AUDIOBOOK and CD records IF those records contain the necessary 34X tags.
340 Field
This field is required for large print materials. Please include one of the following statements depending on the font size:
340 |nlarge print |2rdafs
or
340 |ngiant print |2rdafs
362 Field
Use it for serials publications. Dates to be used in this field are chronological designations that identify individual issues of the continuing resource. Dates can be formatted or unformatted. First indicator "0" means formatted date ; first indicator "1" means unformatted date.
362 0_ Volume 1-March 3, 1923-