b'Maintaining a Catalog / Making ReferencesHow a library revises its catalog depends upon the kind of catalog. In an online catalog the revisionprocess depends upon the software employed in the catalog. If the software provides global updatecapability, the revision of many bibliographic records at once is simple. If they must be revised oneby one, the process is still immensely easier than revising cards in a card catalog. In a card catalogthe subjects are physically erased and retyped, either on all the cards on which they appear or on thesubject entry cards alone. If in a card catalog replacement of a term is desirable but the number ofbibliographic records to be revised is prohibitive, a history note can be used instead. A history noteis simply a card at both the old and the new form indicating the change. When, for example, theheading Insurance, Health is changed in Sears to Health insurance, the two cards would read asfollows:Insurance, Health. For materials issued after [date] consult the following heading:Health insuranceandHealth insurance. For materials issued before [date] consult the following heading:Insurance, Health.There is also the option, provided the software allows for it, of displaying a history note in an onlinecatalog in lieu of revising the bibliographic records.MAKING REFERENCESOnce an item has been assigned a subject heading, either a heading found in the List or one added asneeded, attention must be directed to insuring that the reader who is searching for this material willnot fail to find it because of insufficient references to the proper heading. References direct the userfrom terms not used as headings to the term that is used, and from broader and related terms to theterm chosen to represent a given subject. The Sears List uses the symbols found in most thesauri topoint out the relationships among the terms found in the List and to assist the cataloger inestablishing appropriate references in the public catalog based upon these relationships. There arethree types of references: See references, See also references, and general references.See ReferencesIn the public catalog See references direct the user from unpreferred or unestablished terms andphrases to the preferred or established terms that are used as subject headings. Under most headingsin the Sears List, following the UF [Used for] label, is one or more suggested terms for Seereferences in the public catalog. A cataloger may want to use some or all of them as references, andmany catalogers add other See references they deem useful. In theory there is no limit to the numberof See references to a particular term, but in practice there may well be, especially in a card catalog.The references will be more useful if the cataloger considers materials from the readers point ofview. The readers profile depends on age, background, education, occupation, and geographicallocation, and takes into account the type of library, such as school, public, university, or special.A-45'