Information:
The See Also From Tracing - Topical Term (550 tag)
of the MARC authority record contains an
established heading used as a subject access point.
Many of the subject headings established in the
Library of Congress Subject Headings(LCSH),
the Sears List of Subject Headings, and the
Library of Congress Subject Headings for Children
(LCAC) include broader terms (BT), narrower terms
(NT), and related terms (RT). Using the 550 tag
creates a see also reference taking the person who
searches by the heading in the 550 tag to the
heading in the 150 tag. We use the see also
reference to help library users narrow their
searches; therefore, we create 550 tags for the
broader terms (BT) and related terms (RT) only.
This takes the search from the broader or related
term to the narrower term.
The Sears List of Subject Headings entry for
Community life reads:
Community Life 307
UF Neighborhood
BT Associations
NT Community and school
Community Centers
Community organization
Scouts and scouting
RT City life
This means we will need to create one 550 tag for
Associations and a second 550 tag for City life.
(See examples)
The local library could also add other 550 tags to
create see references from other terms that library
users tend to search for as broader terms or
related terms.
Indicators
First Undefined
blank Undefined
Second Undefined
blank Undefined
Subfields
Main term portion
a Topical term (NR)
Subject subdivision portion
v Form subdivision (R)
x General subdivision (R)
y Chronological subdivision (R)
z Geographical subdivision (R)
Examples:
LCSH
150 _aEducation, Primary
550 _aEarly childhood education
150 _aUniversities and colleges
_xEntrance examinations
550 _aEducational tests and measurements
550 _aPrediction of scholastic success
550 _aUniversities and colleges
_xExaminations
150 _aCommunity life
550 _aAssociations, institutions, etc.
550 _aCommunity
550 _aHuman ecology
150 _aDogs
550 _aDomestic animals
150 _aSnowmen
550 _aSnow sculpture
Sears
150 _aCommunity life
550 _aAssociations
550 _aCity life
150 _aAutomobiles
550 _aHighway transportation
550 _aVehicles
150 _aElementary education
550 _aEducation
150 _aCleanliness
550 _aHygiene
550 _aSanitation
150 _aColleges and universities
_xEntrance examinations
550 _aEducational tests and measurements
550 _aExaminations
AC
150 _aCleanliness
550 _aHealth
550 _aSanitation
550 _aGrooming
550 _aOrderliness
150 _aPearl diving
550 _aPearl industry and trade
150 _aSpies
_vFiction
550 _aIntelligence service
_vFiction
Local
150 _aLocal authors
550 _aAuthors
550 _aAmerican authors
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