Indicators and subfield codes
No information provided
0 No restrictions
1 Restrictions apply
‡a Terms governing access (NR)
‡b Jurisdiction (R)
‡c Physical access provisions (R)
‡d Authorized users (R)
‡e Authorization (R)
‡u Uniform Resource Identifier (R)
‡2 Source of term (NR)
‡3 Materials specified (NR)
‡5 Institution to which field applies (NR)
‡8 Field link and sequence number (R)
Field definition and scope
Information about restrictions imposed on access to the described materials.
For published works, this field contains information on limited distribution. For continuing resources, the restrictions must apply to all issues.
Guidelines for applying content designations
First Indicator - Restriction
Indicates whether materials are restricted or unrestricted.
- No information provided
Value indicates that no information is provided about whether the note states that materials are restricted or unrestricted.
0 - No restrictions
No restrictions on access to materials.
1 - Restrictions apply
Access restrictions on some or all of the material.
Second Indicator - Undefined
The second indicator is undefined and contains a blank ().
‡a - Terms governing access
Subfield ‡a defines legal, physical, or procedural restrictions imposed on individuals wishing to see the described materials.
506 1 Classified.
506 0 Available to subscribing member institutions only.
506 1 Confidential.
‡b - Jurisdiction
Subfield ‡b contains the name of a person, an institution or a function or position within the institution by whom or which the terms governing access are imposed and/or enforced and to whom the restriction may be appealed.
506 Restricted access; ‡c Written permission required; ‡b Donor
506 1 ‡3 Office files of Under Secretary ‡a No one may examine these records or obtain information from them or copies of them except by written
permission; ‡b Secretary of the Treasury or his duly authorized representative; ‡c Kept in remote storage; access requires 24 hours advance notice.
‡c - Physical access provisions
Subfield ‡c describes any arrangements required for physical access that may change from time to time.
506 0 Restricted: Material extremely fragile; ‡c Access by appointment only.
‡d - Authorized users
Subfield ‡d defines the class of users or specific individuals (by name or title) for whom the restrictions in subfield ‡ a do not apply.
506 Closed for 30 years; ‡d Federal government employees with a need to know.
‡e - Authorization
Subfield ‡e identifies the source of the authority for the restriction.
506 0 Classified under national security provisions; ‡b Department of Defense; ‡e Title 50, chapter 401, U.S.C.
‡f - Standardized terminology for access restriction
Subfield ‡f contains data taken from a standardized list indicating the level or type of restriction. You may use terms of your choice or those from the Standardized Terminology for Access Restriction from the DLF/OCLC Registry of Digital Masters Working Group.
506 Closed until January 1, 2068. ‡f No online access ‡2 star
‡g - Availability data
Subfield ‡g contains the date when the resource changes its access status (e.g., when it becomes freely available). Preferred structure for the date is according to the format yyyymmdd in accordance with ISO 8601, Representation of Dates and Times. The mm and dd positions contain zeroes when the data is unknown.
506 0 Open access ǂg 20190207
‡q - Supplying agency
Subfield ‡q contains a MARC Organization Code, International Standard Identifier for Libraries and Related Organizations (ISIL), or textual name of the organization or project responsible for the data in the field. See MARC Code List for Organizations, which also includes links to Canadian, United Kingdom, and German MARC Organization Code lists, along with the International Standard Identifier for Libraries and Related Organizations (ISIL).
506 This collection is open for research ǂq InMuB
‡u - Uniform Resource Identifier
The Uniform Resource Identifier (URI), for example a URL or URN, provides electronic access data in a standard syntax. The data that is accessed by the URI contains additional information about access restrictions. Repeat subfield if digital object has multiple identifiers (URIs).
Substituting hexadecimal notation for diacritics and special characters in Uniform Resource Identifiers. When recording a URI in subfield ‡u, you may enter most of the spacing characters listed below as either characters or their hexadecimal equivalents. Consult the table below.
|Alternative entry (hex value)
|Enter as character or hex value
|Spacing circumflex/circumflex accent
|Spacing underscore/low line1
|Spacing grave/grave accent
|Enter as hex value only
1Because the Spacing Underscore may cause problems with MARC output, users may prefer to continue entering it with the hexadecimal value %5F.
506 1 Some restrictions apply. Consult restricted access file for restriction details: ‡u <URI>
‡2 - Source of term
Subfield ‡2 contains a MARC code identifying the source of the term used to record the restriction in subfield ‡f. Use a separate subfield for each source. The source of the MARC code is Access Restriction Term Source Codes that is maintained by the Library of Congress.
506 1 ‡3 Use copy ‡a In copyright material. Searches will return text snippets only. ‡f Preview only ‡2 star
‡3 - Materials specified
Subfield ‡3 indicates the part of the described material to which the field applies.
506 1 ‡3 Office files of Under-Secretary ‡a No one may examine these records or obtain information from them or copies of them except by written
permission; ‡b Secretary of the Treasury or his duly authorized representative; ‡c Kept in remote storage; Access requires 24 hours advance notice.
‡5 - Institution to which field applies
Subfield ‡5 contains the MARC code of the institution or organization that holds the copy to which the data in the field applies. It is used for institution-specific information that may or may not apply to the universal use of the holdings record. See MARC Code List for Organizations, which also includes links to Canadian, United Kingdom, and German MARC Organization Code lists.
506 1 Access restricted to users with a valid Harvard ID ‡f License ‡2 star ‡5 MH
‡8 - Field link and sequence number
Subfield ‡8 contains data that identifies linked fields and may also propose a sequence for the linked fields. Subfield ‡8 may be repeated to link a field to more than one other group of fields.
The structure and syntax for the field link and sequence number subfield is: ‡8<linking number>.<sequence number>\<field link type>
The linking number is the first data element in the subfield and required if the subfield is used. It is a variable-length whole number that occurs in subfield ‡8 in all fields that are to be linked. Fields with the same linking number are considered linked.& A linking number of "0" (zero) is not used in this field.
The sequence number is separated from the linking number by a period "." and may be optional. It is a variable-length whole number that may be used to indicate the relative order for display of the linked fields (lower sequence numbers displaying before higher ones).
The field link type is separated from preceding data by a reverse slash "\". It is a code indicating the reason for the link and it follows the link number or sequence number if present. The following one-character field link type code has been defined for use in subfield 8 in OCLC local holdings records: a - Action
Code a is used in a record to link one or more fields with another field to which the processing or reference actions relate. This code is typically used only when there is more than one 5XX that relates to another 5XX field.
541 ‡8 1.1\a ‡3 Public School and College Authority and Trade School and Junior College Authority project files ‡a Finance Dept ‡c
Transferred ‡u http://www.columbia.edu/dlc/linglung/methodology.html
583 ‡8 1.2\a ‡a Appraised ‡c 198712- ‡l tjb/prr
583 ‡8 1.3\a ‡a Scheduled ‡c 19880127 ‡k mc/dmj
583 ‡8 1.4\a ‡a Arranged ‡c 19900619 ‡k mc/dmj
583 ‡8 1.2\a ‡a Processed level 2 ‡b 90.160 ‡c 19901218 ‡k kmc/dmj