Man pages matching name maxmind::db::reader in section 3pm:

MaxMind::DB::Reader.3pm.en	debian 10 / libmaxmind-db-reader-perl
MaxMind::DB::Reader.3pm.en	debian 11 / libmaxmind-db-reader-perl
MaxMind::DB::Reader.3pm.en	debian 12 / libmaxmind-db-reader-perl