Dedupe 4.8: Optional Group - 010 $a - LCCN (Verify)
LC changed the structure of the LCCN beginning on Jan. 1, 2001 in order to accommodate a four-digit year. The length of the control number remains 12 characters as it was prior to the change. However, in the old LCCN structure (A), suffixes were occasionally used. Under the new LCCN structure (B), the location of elements is slightly altered to accommodate a four-digit year. Under both structures, the prefix, year and serial number are the basic elements required to make a LCCN unique.
LCCN - 010 subfield a: For the Library of Congress Control Number, the subfield a will be used as default. For searching only (not changed in the final record), this field will be normalized. This will remove extra spaces, punctuation and extra data that is usually contained in a different subfield.
- Examples of LCCN normalization:
Example 1: ###755262 becomes 75005262 Example 2: ###80020863 /AC/r86 becomes 80020863ACr86 and 80020863 Both will be searched to find a potential match.
1.0 - 2.0 - 3.0 - 4.0 - 5.0 - 6.0