MARC21 – application in the Swiss National Library NL

01X-09X: Numbers and Code Fields

019 - Interne Bemerkung (R)

020 - International Standard Book Number (R)

022 - International Standard Serial Number (R)

024 - Other Standard Identifier (R)

028 - Publisher or Distributor Number (R)

030 - CODEN Designation (R)

034 - Coded Cartographic Mathematical Data (R)

035 - System Control Number (R)

037 - Source of Acquisition (R)

040 - Cataloging Source (NR)

041 - Language Code (R)

044 - Country of Publishing/Producing Entity Code (NR)

080 - Universal Decimal Classification Number (R)

082 - Dewey Decimal Classification Number (R)

083 - Additional Dewey Classification Number (R)

084 - Other Classification Number (R)

085 - Synthesized Classification Number Components (R)

090 - Lokale Datenverwaltung (R)