Serials are publications issued in successive parts, usually at regular intervals, and as a rule, intended to be continued indefinitely. Unbound serials are counted as volumes when the library has at least half of the issues in the publisher s volume. This includes audiocassettes, audiocartridges, audiodiscs, audioreels, talking books, and other sound recordings. Materials in electronic format are physical units such as CD-ROMs, magnetic tapes and magnetic disks that are designed to be processed by a computer. Excluded are bibliographic records used to manage the collection, library system software, and microcomputer software used only by the library staff Video materials are materials on which pictures, sound, or both are recorded.
Electronic playback reproduces pictures, sounds or both using a television receiver or monitor.
Subscriptions refers to the arrangement by which, in return for a sum paid in advance, periodicals, newspapers, or other serials are provided for a specified number of issues. The total number of subscriptions reported may include duplicates. This activity includes checking out, either manually or electronically, and also renewing, each of which is reported as a circulation transaction. This does not include interlibrary loan items sent to other libraries. An interlibrary loan is an item of library material, or copy of the material, provided by one library to another upon request.