Alternate Class Numbers | Law | Translations

 Volume Numbers | CIP Records

 Date of Imprint in Call Number | Multiple Versions of a Single Title | Congress or Meeting Name Main Entry

 Editions | Supplementary Works | Classification Numbers Subarranged by Date 

X as an Element of Date


Central University Libraries use the Library of Congress (LC) classification schedules to classify books added to the collection. Call numbers (the classification number plus additional elements to create a unique identifier for shelving) are either LC 050 assigned call numbers; member assigned call numbers (050-second indicator 4 or 090); or, locally created original call numbers using the LC classification schedules. In most cases LC assigned numbers are accepted without change, and are to be preferred over member assigned call numbers when both are present in a record. The following guidelines cover the questions that arise most often. For further guidance consult the Library of Congress Subject Cataloging Manuals (Classification and Shelflisting).


Alternate Class Numbers

Alternate class numbers are found in records for analyzed classed together serials and multipart items (e.g. sets); bibliographies; and, certain areas of literature. They are identified by the presence of two call numbers in the call number field. The alternate class number is placed in the second subfield a (|a). When the alternate class number is to be used (see below) the appropriate Cutter and date must be added following the Library of Congress classification schedules and the LC Cutter Table (Appendix A).

Analyzed set/serial.

For analyzed sets/serials LC provides the collective call number in the first subfield |a with captions/numbering (v., no., Bd., etc.) for the specific work. The second subfield |a contains an alternate class number based on the contents of the individual work. If the first subfield |a is a collective number for an analytic give the book to a Set/Serials Specialist.


050: __: |a DS42 |b .M46a no. 43 |a HD2065.2


Bibliographies may be classified in a Z class number or in a class number based on the subject matter. Most current LC bibliographic records for bibliographies have a Z call number followed by an alternate subject class number in a separate subfield |a.


050: __: |a Z8182 |b .W57 |a PR4484


Follow the instructions below to determine where to classify bibliographies.



When the book is a bibliography and no subject specific number is present in the bib record, give the book to a cataloger for call number assignment.

PZ1-4 Literature/fiction in English.

LC used the PZ 1-4 classification table between 1906-1980. During this time a fiction call number was assigned and usually an alternate literature class number was given. Works of fiction are no longer classed in the PZ1-4 range. Do not use PZ1-4. Search the LC online catalog for an edition with a non-PZ call number when an older bib record has a PZ1-4 class number and no alternate class number. If a class number is not found in the LC catalog, complete the cataloging and give it to a cataloger for call number assignment.


050: __: |a PZ3.S7986 |b Fo 1979 |a PR9619.3.S75 (literature)


If LAW appears in the 050, complete the cataloging and give it to a cataloger for call number assignment.


Shelflisting is the activity of determining additions to the classification number that provide a unique call number for the book. The additions include Cutter numbers, dates, and work letters. The following examples cover instances that require special attention to these sections of the call number. See the glossary for definitions of terms.


Translations are distinguished from the original work by using the Cutter of the original work modified by the application of the Translation Table. The Translation Table is used only when a uniform title plus language(s) is provided and when the main entry is a personal author or title. Catalogers doing original and member input copy follow the instructions found in the LC Subject Cataloging Manual: Shelflisting G150: Translations.

Volume Numbers

The presence of a volume number in the call number (vol., no., pt., Bd., etc.) indicates the record is an analytic. Follow separate instructions for cataloging analytics in sets and serials.

Cataloging in Publication (CIP) Records

When LC upgrades a Cataloging in Publication (CIP) record to full level, they do not always adjust the date used in the call number if it differs. Check and adjust the date used in the call number to reflect the date/s in the book as published.

Date of Imprint in Call Number

Since April 1982 the LC policy is to add the date of imprint (260 |c) to all monographs. CUL follows this policy. Add the date when cataloging older books that lack the imprint date in the call number.


RULES FOR ADDING DATES (CSB 19, p.25 and the LC Subject Cataloging Manual: Shelflisting, section G140)

Date in 260 field

Date used in call number


1970z (if corporate body, use 1970)


1970z (if corporate body, use 1970)


1900z (if corporate body, use 1900)


1900z (if corporate body, use 1900)



ca. 1976


1981, c1980


1971, c1972


1979 [i.e. 1978]


1962 or 1963


1969 (1973 printing)

1969 (CSB 41, p. 87)

1980 printing, c1957

1957 (CSB 41, p. 87)

1979 [distributed 1980]




between 1977 and 1980




1977 (cover 1978)


Multiple Versions of a Single Title

Use the following table when a single title has been published in multiple versions.


Original work

Cutter and date

.L55 1952

Facsimile or photocopy of original work

Cutter and date with a

.L55 1952a

.L55 1952aa (for a second photocopy

Edition or reprint

Cutter and date

.L55 1967

Facsimile or photocopy of edition

Cutter and date of edition with a

.L55 1967a

.L55 1967aa





Meeting Name Main Entry

If the main entry is the name of a congress or conference, a Cutter is established for the name of the meeting and the date of that meeting (rather than the imprint date) is added to the call number. If a date is not present use the imprint date. Note: a change in the conference name will necessitate a new Cutter.


111:2_:International Conference on Basement Tectonics |n (13th : |d 1997 : |c Blacksburg, Va.)

260:__:Boston : |b Kluwer Academic, |c c1999


Call number: QE601 .I6 1997


Use the imprint date (publication, copyright, distribution) for later editions of the same work (same author and title, classification, and Cutter). If another edition is received with the same imprint date, use work letters starting with b to distinguish the works.


.I33 1982 .I33 1982b .I33 1982c .I33 1982d

Supplementary Works

Supplements, appendices, indexes, addenda, etc., are considered supplementary works. These instructions cover separately issued subordinate works that continue or complement a specific book and which are not cataloged separately. Supplementary material that is not cataloged separately is covered by a statement in the physical description area or covered by a note. (See Subject Cataloging Manual: Shelflisting, G850 for further information.) Use the identifying word found on the supplementary material in the call number. If there is no identifying word used in the supplementary note, use the Suppl. as the designation in the call number.


Original work:

HG4026 Archer, Stephen Hunt.

.A745 Financial management c. 1983.

1983 xix, 764 p. : ill. ; 25 cm. + tables


Call number for supplementary material:





Classification Numbers Subarranged by Date

If a work is classed in an area that is subarranged by date only, do not add the imprint date to the call number.

When additional works are received subarranged by the same date add a work letter starting with "a" to the date in order to distinguish the works.


CD1106 1918 (original work)

CD1106 1918a (second work received)

CD1106 1918b (third work received)


If a work is classed in an area that is subarranged by date and there is a intervening Cutter add the date of imprint to the call number.


GV722 1952 .W4 1981 [book on the 1952 Olympics]

X As an Element of the Date

Some libraries add an x (1999x) as the last element of an LC call number to indicate that the local library assigned the number. Delete the x from the call number on the holdings record.





CIL 09/10/2002


For questions about the content of this page, please contact Clare Lattimore clattimo@mail.smu.edu

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Last updated 3/10/2010