Man pages matching name marc::file::usmarc in section 3pm:

MARC::File::USMARC.3pm.en	debian 10 / libmarc-record-perl
MARC::File::USMARC.3pm.en	debian 11 / libmarc-record-perl
MARC::File::USMARC.3pm.en	debian 12 / libmarc-record-perl