Milner Library owns many paper and CD-ROM indexes. For a separate listing of these indexes consult the library handout Major Indexes and Abstracts . Often used to refer to the Library of Congress classification system , the system used by many college and university libraries to arrange materials by subject. Magazines are usually published weekly or monthly and generally contain advertising and color illustrations. The articles are shorter and less authoritative than those found in scholarly journals .
Libraries frequently replace the paper issues of periodicals with microform copies.
Microfilm refers specifically to pieces of 35mm film wound onto plastic reels. The term microform applies generally to any reduced image format that is on film or paper. A library catalog in the form of an electronic database that is accessed by a computer terminal. The status of an item that has not been returned to the library by its due date . A fine may be charged to a user who does not return library material when it is due.