[Koha] AMS (MSC) public sources?

Hello Everybody, I am working at installing Koha for IMAR (Institute of Mathematics of the Romanian Academy), and it is highly important for them to configure Koha to allow AMS (MSC) dictionary search. So I write to ask for advice regarding the posiblity to import AMS from public sources of information into MARC21 fields, if such sources exist. Thank you very much in advance, Rodica Balasa