I recomend that convert groups of 1,000 records using Marcedit and import into koha using the webtool "Stage MARC Records For Import" to get more control and identify errors. Verify the info about ITEMS (tag 952 and subfields). Saludos, Felipe Adalid Ortiz Anzaldo Bibliotecario de sistemas Universidad Iberoamericana Tijuana Biblioteca Loyola http://clavius.tij.uia.mx Ave. Centro Universitario 2501 Playas de Tijuana 22200, Tijuana, B.C. 0 664 630-1577 Ext. 623 adalid@tij.uia.mx