srdcat@loc.gov
For questions concerning LC serial record tagging and input (with field 042 *lc*)

issn@loc.gov
For questions concerning the assignment
of the ISSN to serial publications or
National Serials Data Program records (with field 042 *nsdp*)

lhaw@loc.gov
For questions concerning other authenticated CONSER records,
documentation, or policies and practices

John Clark
For questions concerning National Library of Canada
catalog records

issn@nlc.bnc.ca
For questions concerning Canadian ISSN

Diane Boehr
For questions concerning National Library of Medicine catalog records