Created attachment 112768 [details] marc21_leader_authorities.pl bug Using marc21_leader_authorities.pl with tag 000 (leader) to add authority records, it´s marked how "undefined" position 18. Position 19 is really undefined in Marc format but 18 not. This one-character code is actually valid and useful according http://www.loc.gov/marc/authority/adleader.html Character function is like position 18 of marc21_leader.pl in tag 000 Regards from Mar del Plata Pablo