[Koha] Import Authorities Data

Hi, What is the best pratice to import Authority data? I have a list of my older system formated as: name;cutter;dates (~60.000 lines). I want format it to Authority database in Koha. What is the best metod? I use the version 3.6 of Koha on Ubuntu 11.10. Thanks -- Tiago Murakami Librarian Biblioteca Pública Municipal Manuel Bandeira São Bernardo do Campo - São Paulo - Brasil