Records that are authenticated with a code of "lc", "lcd", or "msc" that have been cataloged by the Library of Congress cataloging sections may be converted to AACR2, but only in the situations covered in B4.3. LC must be notified of the change in all cases. When making the conversion, the CONSER cataloger:

Leaves the original LC control number in subfield $a of the 010 field and adds a revision date (see instructions in field 010);

Does not change the authentication code "lc" in field 042;

Adds "AACR2=[OCLC symbol of institution]" in field 936 (e.g., AACR2-EYM).

For further guidelines concerning the conversion of a pre-AACR2 LC-authenticated record, see C3 and C8.

See also:

C9.1. Restrictions and procedures