MARC 21 Format for Bibliographic Data: 856: Electronic Location and Access (Network Development and MARC Standards Office, Library of Congress)

Information needed to locate and access an electronic resource. The field may be used in a bibliographic record for a resource when that resource or a subset of it is available electronically. In addition, it may be used to locate and access an electronic version of a non-electronic resource described in the bibliographic record or a related electronic resource.

See the Guidelines for the Use of Field 856 for a more thorough discussion on the use of field 856.

Field 856 is repeated when the location data elements vary (the URL in subfield $u or subfields $a and $d, when used). It is also repeated when more than one access method is used, different portions of the item are available electronically, mirror sites are recorded, different formats/resolutions with different URLs are indicated, and related items are recorded.

Indicators

First - Access method: # - No information provided; 0 - Email; 1 - FTP; 2 - Remote login (Telnet); 3 - Dial-up; 4 - HTTP; 7 - Method specified in subfield $2
Second - Relationship: # - No information provided; 0 - Resource; 1 - Version of resource; 2 - Related resource; 8 - No display constant generated

Subfield Codes

$a - Host name (R): Fully qualified domain (host name) of the electronic location. It contains a network address which is repeated if there is more than one address for the same host.

$c - Compression information (R): Information about the compression of a file, in particular, whether a specific program is required to decompress the file.

$d - Path (R)

$f - Electronic name (R)

$m - Contact for access assistance (R)

$o - Operating system (NR)

$p - Port (NR): Portion of the address that identifies a process or service in the host.

$q - Electronic format type (NR): Identification of the electronic format type, which is the data representation of the resource, such as text/HTML, ASCII, Postscript file, executable application, or JPEG image. Electronic format type may be taken from enumerated lists such as registered Internet Media Types (MIME types).

$s - File size (R)

$u - Uniform Resource Identifier (R): Uniform Resource Identifier (URI), which provides standard syntax for locating an object using existing Internet protocols. Field 856 is structured to allow for the creation of a URL from the concatenation of other separate 856 subfields. Subfield $u may be used instead of those separate subfields or in addition to them.; Subfield $u may be repeated only if both a URN or a URL or more than one URN are recorded.

$v - Hours access method available (R)

$w - Record control number (R)

$x - Nonpublic note (R)

$y - Link text (R)

$z - Public note (R)

$2 - Access method (NR): Access method when the first indicator position contains value 7. Code from: Electronic Access Methods Code List.

$3 - Materials specified (NR)

$6 - Linkage (NR): See description of this subfield in Appendix A: Control Subfields.

$7 - Access status (NR): Code indicating the availability of access to the remote electronic resource the address of which appears in subfield $u. Subfield $7 applies to all subfields $u present in the field.

$8 - Field link and sequence number (R): See description of this subfield in Appendix A: Control Subfields.

Examples

856	42$3Finding aid$uhttp://www.loc.gov/ammem/ead/jackson.sgm
856	40$3HathiTrust Digital Library, Full view$uhttp://catalog.hathitrust.org/api/volumes/oclc/1654047.html$70
856	41$uhttp://www.jstor.org/journals/0277903x.html
856	40$uhttp://www.cdc.gov/ncidod/EID/eid.htm$qtext/html
856	1#$uftp://harvarda.harvard.edu
856	42$3French version$uhttp://www.cgiar.org/ifpri/reports/0297rpt/0297-ft.htm
856	42$3Essays from annual reports$uhttp://woodrow.mpls.frb.fed.us/pubs/ar/index.html
856	1#$uftp://wuarchive.wustl.edu/mirrors/info-mac/util/color-system-icons.hqx$s16874 bytes
856	2#$utelnet://maine.maine.edu
856	1#$uftp://wuarchive.wustl.edu/mirrors2/win3/games/atmoids.zip$cdecompress with PKUNZIP.exe$xcannot verify because of transfer difficulty
856	4#$zPart of the Ovid Mental Health Collection (MHC). Follow instructions on MedMenu page for Ovid login.$uhttp://info.med.yale.edu/medmenu/info%5Fcbc.html
856	40$uhttp://www.ref.oclc.org:2000$zAddress for accessing the journal using authorization number and password through OCLC FirstSearch Electronic Collections Online. Subscription to online journal required for access to abstracts and full text
856	4#$uhttp://susdl.fcla.edu/cgi-bin/cgiwrap/~fdl/fdlcgi?FA00000011%2Fjpg$yElectronic resource (JPEG)
856	4#$uhttp://susdl.fcla.edu/cgi-bin/cgiwrap/~fdl/fdlcgi?FA00000011%2Fpdf$yElectronic resource (PDF)

856	2#$aanthrax.micro.umn.edu
856	1#$amaine.maine.edu$cMust be decompressed with PKUNZIP$fresource.zip
856	0#$akentvm.bitnet$facadlist file1$facadlist file2$facadlist file3
856	0#$auicvm.bitnet$fAN2
856	2#$amadlab.sprl.umich.edu$p3000
856	10$zFTP access to PostScript version includes groups of article files with .pdf extension$aftp.cdc.gov$d/pub/EIS/volno/adobe$f*.pdf$qapplication/pdf

856 - Electronic Location and Access (R)

Indicators

Subfield Codes

Examples