|Required if applicable/Optional|
|1st Indicator Existence in LC collection|
|No information provided|
|0||Item is in LC|
|1||Item is not in LC|
|2nd Indicator Source of call number|
|No information provided|
|0||Assigned by LC|
|4||Assigned by agency other than LC|
|Subfields (R=Repeatable NR=Nonrepeatable)||Input Standards|
|‡a||Classification number (R)||Mandatory/Mandatory|
|‡b||Item number (NR)||Required if applicable/Required if applicable|
|‡d||Supplementary class number (R)||Obsolete. Do not use/Obsolete. Do not use|
|‡3||Materials specified (NR)||Optional/Optional|
|The LC call number and/or class number. |
Use field 055, field 060, or field 070 for call numbers based on LC classification schedules and assigned by the Library and Archives Canada, the National Library of Medicine, or the National Agricultural Library. Use field 099 for classification numbers that are local modifications of LC class numbers.
If cataloging copy has a classification number following the name of any other contributing institution, do not enter the classification number in field 050.
See "Map and atlas call numbers" below for information on entering and printing map and atlas call numbers.
If you are transcribing LC copy, enter LC call numbers in field 050. However, LC does not classify some types of material. LC copy for unclassified material may have the word LAW or the phrase NOT IN LC. If you are transcribing such copy, do not include this word or phrase in field 050. You may enter a locally assigned call number in field 090 or field 050 with first indicator value blank or 1 and second indicator value 4.
If you assign a Library of Congress classification number according to the LC class schedules, use field 090 or field 050 with first indicator value blank or 1 and second indicator value 4. If the classification portion of your number does not conform to the LC class schedules, use field 099.
|Microform shelf numbers|| |
Prior to 1981, LC used a single-record technique to indicate the microform replacement of an original item for preservation. Such records contain both the call number of the original and the microform shelf number of the replacement.
Pre-1981 replacement shelf numbers include a term that designates the type of microform (e.g., "Microfilm") and a number of one-to-five digits. The number may also include additional words, notations (e.g., "reel 1, no. 3"), and, usually, a class letter or letters from the LC classification system. Enter such shelf numbers in subfield ‡a. Enter a space between each element.
Enter the call number of the original in the first field 050. Use 1st indicator value blank or 1 and 2nd indicator value 0 . Enter the microform shelf number in the second 050 field, 1st and 2nd indicator value 0 .
University Microfilms dissertations, 1940–1961. From 1940 to 1961, dissertations from University Microfilms in the National Union Catalog had the following style of call number:
If you are transcribing such copy, enter the call number in subfield ‡a with spaces between each element.
|REC shelf numbers|| |
In LC-created records, sound recordings have two 050 fields. The first has a suggested class number and 1st indicator value blank or 1 because sound recordings are not shelved by class number at LC. The second 050 field has custodial information and 1st indicator value 0 .
|Serial shelf numbers|| |
If some issues of the serial have appeared in one or more series over a period of time, each with a different call number, the field is repeated for each call number involved.Other shelf numbers.
Enter Newspaper in subfield ‡a ( USNP use only):
Do not enter IN PROCESS or minimal-level cataloging numbers (e.g., MLCM 81/3002 (B), WMLC L82/1234) in subfield ‡a.
|Entering call numbers in 050 and 090|| |
Fields 050 and 090 print for institutions profiled for LC or NLM call numbers. The print program recognizes and parses LC call numbers in terms of predefined elements. The print program parses the first 7 elements. An eighth element prints on a new line. Subsequent elements are free format. The following table lists the first 10 predefined elements ( a = alpha, n = numeric, x = alpha or numeric character).
The definitions of these elements remain constant, even if a call number lacks an element. For example, the first Cutter number is element 5 even if the call number has no date preceding the first Cutter number.
|Entering call numbers|| |
|Existence in LC collection. Whether the item is in LC's collections.|
|Source of call number. The source of the classification/call number.|
|‡a Classification number||The class number portion of the call number.|
|‡b Item number||The item number portion of the call number.|
|‡d Supplementary class number||Obsolete. Do not use.|
|‡3 Materials specified||A subset of the described material. Determine placement according to use.|
|The print program parses elements 1–7, identifying elements and determining where to print them in relation to preceding and following elements (e.g., on the same line or on a new line). Your profile determines line breaks and the printing of decimal points before Cutter numbers.|
If an eighth element is present, the print program prints it on a new line. Subsequent elements are free-format elements. The print program does not format these elements for printing. You must enter a comma and a space in the field to indicate each line break. The comma does not print. It shows where a new line should begin. Use the following examples as guidelines:
If one or more lowercase letters follow either the first or second Cutter number or final date, with no intervening space, the letters print on the same line. Use the following examples as guidelines:
If the second Cutter number is a single letter, the print program recognizes that letter as a Cutter number and prints it on a new line. Enter the call number with the subfield ‡b between the two Cutters.
If the print program cannot automatically format a call number correctly or if a call number does not fit the pattern of 1–7 elements plus free-format elements, enter all elements as free-format elements. Use a comma-space to designate line breaks for each element in subfield ‡b. Do not enter a decimal before the first element in subfield ‡b. Use the following examples as guidelines:
See field 090 (Locally Assigned LC-type Call Number) for more information.
|Printing problems|| |
If the call number has second or subsequent lines that exceed your profiled margin size (two characters fewer than the first indention), the print program produces unit ( zc) cards.
Furthermore, the print program cannot format certain LC call numbers for printing. If you are having printing problems, check the following characteristics of the numbers you are entering:
|Printing nine or more characters|| |
To produce cards for call numbers that have nine or more characters (e.g., translations), shorten the number. If your shelf arrangement does not require a specific item number, enter one space or a comma-space to break the item number into two lines. If your shelf arrangement requires a specific item number, use field 099.
|Printing unusual numbers|| |
The following examples cause unit ( zc) cards or are formatted incorrectly on cards. Use field 099 to produce cards with such call numbers.
|Map and atlas call numbers|| |
Maps. LC places the item Cutter in subfield ‡b . The item Cutter is always the final element in an LC map call number.
Atlases. LC places the item Cutter in subfield ‡b . However this is not the final element. The item Cutter is always followed by the date of publication of the atlas.
You should follow LC practice when entering map and atlas call numbers. However you must edit some map and atlas call numbers to print them correctly. The following examples of hypothetical map and atlas call numbers show how to enter the call number in field 050 or field 090 and how to edit the field for card production. (Alternatively you may repeat the call number in field 099 for card production.)
Map call numbers that contain a colon (e.g., G6713.F7:3G6P2 1976 ‡b .L5) cause zc cards. To produce cards with such call numbers, repeat the call number in field 099.
Map call numbers in LCMARC records may contain two spaces at the end of subfield ‡a . You should enter only one space at the end of subfield ‡a .
See LC's Class G schedule for more information.