Information:
The Heading - Topical Term (150 tag) of the MARC
authority record usually contains an established form
of a term that can be used as a subject heading.
Topical subject headings are established by agencies
that publish them in either print or electronic form.
The most common sources of topical subject headings
are the Library of Congress Subject Headings
(LCSH), the Library of Congress subject headings for
children's literature (LCAC) and the Sears List of
Subject Headings. In addition to established
sources of subject headings, local libraries may add
their own subject headings. Sears requires the local
library to establish many headings, for example, the
names of animals, birds, minerals, and chemicals. The
library may also create local subject headings that
would be useful to the people who use the library.
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
150 _aDogs
_vFiction
150 _aVietnamese Conflict, 1961-1975
150 _aJohn, the Baptist, Saint, in the Koran
150 _aUniversities and colleges
_xEntrance examinations
150 _aArt, Modern
_y19th century
_xHistory
150 _aMafia
_zUnited States
150 _aHolmes, Sherlock (Fictitious character)
150 _aShipbuilding industry
_zPoland
_xEmployees
150 _aJudaism
_xHistory
_yTalmudic period, 10-425
Sears
150 _aElementary education
150 _aDogs
_vFiction
150 _aVietnam War, 1961-1975
150 _aColleges and universities
_xEntrance examinations
AC
150 _aDogs
_vFiction
150 _aLove
_vFiction
150 _aSpanish language materials
_xBilingual
Local
150 _aLocal authors
|
