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Why would you need to include number of pages in a report?
physical collections inventory
planning collection shifts, especially when books are not located together and direct measurement (linear feet) is not feasible
estimating the number of trucks needed to move materials to the Annex or another location
doing tracers; height of volume and number of pages give an approximation of the size of the item being searched for
counting the number of exposures needed to scan or copy a book
Where are page number data fields stored?
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.
What is a leaf? A leaf is a piece of paper printed on one side. A "page" is a piece of paper printed on 2 sides (e.g. 100 pages is 50 pieces of paper printed on 2 sides)
The "folio_derived.instance_physical_descriptions" derived table is created from the instance physical descriptions array, but shows the entire 300 field, 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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