# - Undefined
Source of classification number
0 - Assigned by LC
4 - Assigned by agency other than LC
|$a - Classification number element-single number or beginning number of span (NR)
$b - Classification number element-ending number of span (NR)
$c - Explanatory term (NR)
|$5 - Institution to which field applies (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)
Single LC classification number or a number span associated with a 1XX heading in an established heading record or a subdivision record. Source of the classification number is Library of Congress Classification and/or the LC Classification Additions and Changes that are maintained by the Library of Congress. The hyphen (-) between the two class numbers in a range of numbers may be generated based on the presence of both subfields $a and $b.
Classification number(s) may be qualified by a descriptive term when the heading is represented in more than one place in the LC classification schedules. Each classification number or number span associated with a heading is contained in a separate 053 field.
Organizations may conform to Library of Congress practice by applying Subject Cataloging Manual: Classification conventions.
|130||#0$aBook of Mormon$xAntiquities|
|151||##$aUnited States$xHistory$yRevolution, 1775-1783|
|053||#0$aMT728$cInstruction and study|
|-||[hyphen associated with the content of subfield $b]|
|( ... )||[parentheses associated with the content of subfield $c]|