Except for bibliographies of law and music, the Library of Congress classification provides for the classification of bibliographies in Z1201-8999. Many libraries who use LC cataloging records prefer to classify bibliographies in topical numbers rather than in the bibliography numbers in class Z. As a service to these libraries, LC provides in its cataloging records for bibliographies both the Z classification number and an alternate topical class number. The latter number is not used to shelve LC’s own copy(ies) of the work.


1. When to assign an alternate number

2. Selecting the alternate number

3. Use of the General works number

4. Establishing new numbers

5. Alternate numbers for specific types of materials

6. Providing the alternate number for the shelflister

See also:

Alternate Class Numbers