Records for serials and integrating resources that are part of the CONSER database (field 042 subfield ǂa coded as pcc, msc, nlc, nsdp, etc.) must contain a valid LCCN. CONSER uses some special prefixes for LCCNs in some records.
LC and CONSER participants used LCCNs prefixed with sc, sf, and sn, referred to as pseudo LCCNs, as follows:LCCNs with the prefix sc were used prior to 2000 in records for serials authenticated by LC, but not held by LC. LCCNs with the prefix sf were used prior to 2000 in records for serials authenticated by LC and held by LC, but given less-than-full cataloging. LCCNs with the prefix sn were used prior to 2000 in records for serials authenticated by CONSER participants and the National Serials Data Program (NSDP). LCCNs with the prefix sn were also used prior to 1984 for serials authenticated by LC and held by LC, but given less-than-full cataloging. LCCNs with the prefix sn are currently used by LC and the United States Newspaper Program (USNP) for cataloging newspapers.
Prior to May 1999, LC assigned unprefixed LCCNs to records for serials previously authenticated with pseudo LCCNs. The unprefixed LCCN would be added to subfield ǂa and the pseudo LCCN moved to subfield ǂz. LC now retains the pseudo LCCN in previously authenticated records it uses for cataloging.
Library and Archives Canada (LAC) records for serials that are part of the CONSER database use LCCNs prefixed with ce, cf, and cn as follows:LCCNs with the prefix ce are used in records for bilingual serials cataloged in English LCCNs with the prefix cf are used in records for bilingual serials cataloged in French LCCNs with the prefix cn are used in records for non-bilingual serials cataloged in English or French
The LAC LCCNs used in the CONSER database are derived from the LAC control number in field 016. When a bilingual serial is cataloged in both English and French the same number will appear in each LCCN following the ce and cf prefixes.