melm 017 Number-legal-deposit,Identifier-standard
melm 018 Identifier-standard
melm 020$a ISBN:w,Identifier-standard:w
-melm 020 ISBN,Identifier-standard
-melm 022$a ISSN:w,ISBN:w
-melm 022 ISSN,Identifier-standard
+melm 020 Identifier-standard
+melm 022$a ISSN:w,Identifier-standard:w
+melm 022 Identifier-standard
melm 023 Identifier-standard
+melm 024$a Identifier-other
melm 024 Identifier-standard
melm 025 Identifier-standard
melm 027 Report-number,Identifier-standard