'''LAC'''<br>In the Canadiana authority file, cataloguers must add the 042 field every time they create, derive or revise an authority record. This code identifies the “virtual” Canadian authority file, which is spread across two separate authority files (LC/NAF and Canadiana). | '''LAC'''<br>In the Canadiana authority file, cataloguers must add the 042 field every time they create, derive or revise an authority record. This code identifies the “virtual” Canadian authority file, which is spread across two separate authority files (LC/NAF and Canadiana). |