MARC 21 Format for Authority Data: 550: See Also From Tracing-Topical Term (Network Development and MARC Standards Office, Library of Congress)

550 - See Also From Tracing-Topical Term (R)

MARC 21 Authority - full

December 2017

First Indicator	Second Indicator
Undefined # - Undefined	Undefined # - Undefined

First Indicator

Second Indicator

Undefined
# - Undefined


Subfield Codes
$a - Topical term or geographic name entry element (NR) $b - Topical term following geographic name entry element (NR) $g - Miscellaneous information (R) $i - Relationship information (R) $v - Form subdivision (R) $w - Control subfield (NR) /0 - Special relationship /1 - Tracing use restriction /2 - Earlier form of heading /3 - Reference display $x - General subdivision (R) $y - Chronological subdivision (R)	$z - Geographic subdivision (R) $0 - Authority record control number or standard number (R) $1 - Real World Object URI (R) $4 - Relationship (R) $5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)

Subfield Codes

$a - Topical term or geographic name entry element (NR)
$b - Topical term following geographic name entry element (NR)
$g - Miscellaneous information (R)
$i - Relationship information (R)
$v - Form subdivision (R)
$w - Control subfield (NR)
     /0 - Special relationship
     /1 - Tracing use restriction
     /2 - Earlier form of heading
     /3 - Reference display
$x - General subdivision (R)
$y - Chronological subdivision (R)

$z - Geographic subdivision (R)
$0 - Authority record control number or standard number (R)
$1 - Real World Object URI (R)
$4 - Relationship (R)
$5 - Institution to which field applies (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

Tracing for a topical term see also from reference.

Used in an established heading or established heading and subdivision record to trace a see also from reference from an established topical term to a related established heading.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

Most of the content designators defined for field 550 are the same as those defined for field 150 (Heading-Topical Term), field 450 (See From Tracing-Topical Term), and field 750 (Established Heading Linking Entry-Topical Term). Description, guidelines, and input conventions for shared content designators are given in the X50 Topical Terms-General Information section.

Guidelines for applying the subfield $w (Control subfield), subfield $i (Relationship information), and $4 (Relationship) in field 550 are given in the Tracings and References-General Information section.

■ EXAMPLES

150	##$aTritheism
550	##$wg$aGod

150	##$aSand Creek Massacre, Colo., 1864
550	##$wg$aIndians of North America$xWars$y1862-1865

(12/18/2017)