By default, MARC extension is configured using the following files:
marcImport.properties:
Title=245;130;210;222;240;246;730;740; Creator=100;110;111; Subject= Description=6XX; Publisher=260a;260b;260f; Contributor=700;710;711; Date=260c; Type= Identifier=920;856u; Source= Language=041;546; Relation=250;534;440;490;800;810;811;830; Coverage= Rights=506;540;
marcImpRemChars.properties
This file is empty by default.