You may use dates as a subdivision for this purpose. However, if you use dates to identify a specific occurrence of an event and do not qualify the subject in terms of time, treat the subdivision as a general subdivision instead. 10 United States. Civil War, 1861-1865. Treat subdivisions that qualify a subject in terms of the time in which items were written as general subdivisions.
Chronological subdivisions apply to the subject itself.
In the following examples, the first entry applies to items written before 1800 about art of any period. The second entry applies to works about 17th-18th century art whenever written. Early works to 1800. The source of the entry is printed at the lower left on the card. Do not enter subject entries or portions of subject entries enclosed in brackets except for LC Children's NLM or NAL headings.