28 CFR 75.3: Categorization of records.

Records required to be maintained under this part shall be categorized alphabetically, or numerically where appropriate, and retrievable to: All name(s) of each performer, including any alias, maiden name, nickname, stage name or professional name of the performer; and according to the title, number, or other similar identifier of each book, magazine, periodical, film, videotape, digitally- or computer-manipulated image, digital image, or picture, or other matter (including but not limited to Internet computer site or services). Only one copy of each picture of a performer's picture identification card and identification document must be kept as long as each copy is categorized and retrievable according to any name, real or assumed, used by such performer, and according to any title or other identifier of the matter.