A computer program to maintain a subject index file on magnetic tape in alphabetical and classified order

This program maintains two subject index files on magnetic tape, one for the main subject index and one for the press‐cuttings subject index. Although these are two distinct indexes, they are held physically as one file on the tape with all press‐cuttings items marked to distinguish them from the normal items. The complete combined file is held twice on the tape, once in alphabetical subject order and once in classification number order.