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- in the MARC record, field 300 is the physical description, and subfield "a" contains the page numbers or leaves (note that the "300" field and the "a" subfield are both repeatable in a record). See Marc21 format for bibliographic data for details.
- The "folio_derived.instance_physical_descriptions" derived table is created from the instance physical descriptions array, but shows the entire 300 field, but without subfield indicators. See derivation code for this table. (Note that instance records that do not have a physical descriptions array will not be in the derived table.)
- NOTE: Some electronic resources have a 300 field showing page numbers, if the original form of the work was print material
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