10.1 Equivalence relationships

USE references are made from unauthorized or non-preferred terms to authorized or valid headings. Reciprocals, in the form of UF (Used-for) references, are made under the valid headings. The referred-from terms include synonyms in direct and inverted word order, alternative spellings (including singular and plural forms), alternative endings, changed or canceled headings, and abbreviations and acronyms. For phrase headings entered in the inverted form, USE references are made from the straight form. For phrase headings entered in the straight form, USE references are made from the inverted form in selective cases. For compound headings and for topical headings subdivided by other topics, USE references are made from the reversed form, thus bringing each significant term to the initial position. Occasionally, USE references are made to broader headings from narrower terms not used as valid headings. USE references are not generally made from equivalents in foreign languages. Examples

10.1 References