It may indicate the quantity and frequency of the accruals.

===$b Frequency of Use===

A measure of reference activity usually expressed as a ratio of a number of retrievals to time period, or by general terms such as active or inactive this subfiield indicates the measure of reference activity, usually expressed as a ratio of a number of retrievals to time period, or by general terms such as active or inactive.

===$5 Institution to which the Field Applies===

If the institution holds more than one copy the shelfmark of the item should be added after a colon.

===$8 Materials Specified===

Part of the described materials to which the field applies.

==Взаємопов’язані поля==