Greetings, One of the libraries that I worked with initially to get Koha up and running used Athena. We had a lot of data cleaning to do before we imported it into Koha. It's been a while, but I may be able to help answer questions. I'm sure my librarian colleague who was part of the process may be able to help answer it too. In the mean time, I recommend getting MarcEDIT (http://people.oregonstate.edu/~reeset/marcedit/html/downloads.html) and then watching some of the videos by Nicole Engard at bywatersolutions.com: http://bywatersolutions.com/2012/01/18/using-marcedit-to-add-koha-items/ http://bywatersolutions.com/2012/04/11/importing-marc-records-in-to-koha-3-8... These are just two of them which should be partly related to what you are going to go through. GPML, Mark Tompsett