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When trying to locate matching copy for serials, it is helpful to keep the following in mind:
This guide is intended to help you choose matching copy, not best copy. Often you will find several records that match. Choosing the best record is a lesson for another day.
Differences in LCCNs do not imply non-match. Often serial LCCNs are revised or changed altogether with the earlier number displayed in |z.
A difference in ISSN alone does not constitute non-match, as publishers occasionally misprint or misuse ISSNs. However, when the ISSN varies, be sure to verify the other descriptive elements of the record to ensure a match.
A difference in Gov’t Doc Classification Number alone does not constitute non-match, but it too is a clue to scrutinize the other descriptive elements of the record to ensure a match
When a corporate body or conference is given the main entry, a change in the form of its entry constitutes a title change. When the item bears a different form of the name, check LCAF. If this form of entry is given in LCAF as a cross-reference (4XX) to the entry that appears on the record, it is not a title change and you can add the volume to that record. However, if it appears as a 5XX (which means that it is a valid form of the name. You will also find an authority record for it as the 11X), it constitutes a title change. If there is no LCAF record for the new form of name, refer to an original cataloger for a title change decision.
When uniform titles appear on serial records, it means that there are several different publications which bear the same title -- search carefully and thoroughly to ensure an exact match. Sometimes the uniform title is qualified by the publisher or the place of publication of the earliest volume seen by the cataloger. When the publishing information changes, however, it is not considered to be a title change. The uniform title and the 260 fields remain the same and the publishing variance is noted in a 5XX field.
245|a Make sure you are using the chief source! If the title varies anywhere else on the piece, it is simply noted in a 246. When the variance occurs between the chief source and copy, use this rule of thumb: a difference in words or word order of the first 5 words in the 245|a necessitates a title change, thus non-match. A variance beyond the first 5 words of the 245|a would be noted in a 246. If in doubt, refer to an original cataloger.
245|b When the |b varies (no matter how many words are in the |a), the record is still an exact match. Do not make a title change. A 500 note stating, “Subtitle varies” is sufficient.
The following differences constitute non-matching editions:
A difference in place of publication or publisher should alert you to check the other descriptive elements of the record to ensure a match. If everything else matches, note the publishing variation in a 5XX note.
As this field offers little information, use it primarily for verification when other descriptive elements are off. Slight differences in size can be noted in this manner: $c22-28 cm. However, be aware that significant differences in size may reflect a difference in edition (such as “Large print ed.). Most often this occurs with government documents.
Frequency changes do not justify a new record; the 310 and 008/fre are updated to reflect the current frequency with earlier frequencies noted in 321 fields. However, occasionally some serials are issued in different frequency editions. Be alert for this!
The 362 field supplies the volume designation for the serial. This information is based upon the first issue. There are two types of changes in volume designation. The first is a change in the descriptive term alone (v. becomes no. or date alone changes to v. and no.) There are various ways of handling this depending upon the circumstances, but the primary point here is that the record is still a match. The second type of change occurs when a publisher begins numbering anew without changing the descriptive term (v. 1-v. 12 (1985-1996) begins again with v. 1 (1997)). This is still a match. A cataloger will close the first run of the 362 and start a new run using an implied [New ser.] We will use n.s.v. in the call number to avoid duplicate call numbers.
[NOTE: This used to constitute a Non-Match; it was treated as a title change in order to avoid duplicate call numbers. The cutter number on the new record was adjusted. Usually a 130 was added to the new record qualified by place of publication and date. You may run into these in the Cat. They are not wrong, but don't emulate them.]
The information contained in notes can often help you to determine the source of a problem when an item does not fit the description contained in the primary fields. This is when it is actually helpful to have several OCLC records for the same title. Reading each record, you will often find decisions made by other institutions recorded in 5XX notes. These can be invaluable in determining Match/Non-Match, but be warned: do not take the decisions as gospel.
When the form of entry changes for an added entry, the record is still a match. If both headings are valid (LCAF 1XX/5XX), include both. Otherwise, use the valid heading.
Related title fields. Examine these fields and make sure the volume in hand does not belong to one of these related titles.