Headings are listed in boldface type. A heading may be followed in italics by the code (May Subd Geog) which shows that the heading may be subdivided by place. It may also be followed by class numbers. Scope notes that give guidance in the meaning or application of a heading may follow in a separate paragraph.

Class Numbers

Many of the headings are followed by Library of Congress class numbers that generally represent the most common aspects of a subject:

If serveral aspects of a subject are covered by different class numbers, the latter are qualified by a term indication the specific discipline to show the distinction:

Scope Note

Scope notes are provided when needed to ensure consistency of subject usage by specifying the range of subject matter to which a heading is applied in the library's catalogs; by drawing necessary distinctions between related headings; or by stating wh ich of serveral meanings of a term is the one to which its use in the library's catalog is limited:

Reference: The Relationship Between Terms

USE References

USE references are made from an unauthorized or non-preferred term to an authorized one. Under the heading referred to, the code UF (used for) precedes the term not used. The codes USE an UF function as reciprocals:

USE references are also made from synonyms, variant spelling, variant forms of expression, alternative constructions of headings, and older forms of headings. Headings consisting of more than one word frequently are not chosen as the entry elemen t: