MARC Mappings - MARC 21 to MODS - MODS to MARC 21 - Dublin Core to MARC 21 - MARC 21 to Dublin Core - Digital Geospatial Metadata to MARC - GILS - MARC to Digital Geospatial Metadata - MARC Character Sets to UCS/Unicode - ONIX to MARC 21 - UNIMARC to MARC 21
U.S. National Level Requirements - MARC 21 Authority - MARC 21 Bibliographic