Specialized:

Code f (008/22 and 006/05 - BK) indicates that the item is narrowly aimed at a particular audience and the nature of the presentation would make the item of little interest to other audiences. Examples of items which are coded f include: (1) technical material geared to a specialized audience and (2) items which address a limited audience, for example, the employees of a single organization.

Example:

008/22 f

245 10$aMARC for library use.