MARC21 – application in the Swiss National Library NL
020 - International Standard Book Number (R)
First Indicator |
Second Indicator |
| # - Undefined | # - Undefined |
Subfield codes |
|
| $a - International Standard Book Number (NR) | $z - Canceled/invalid ISBN (R) |
| $c - Terms of availability (NR) | $9 - Gelöschte/ungültige ISBN mit Bindestrichen (R) |
| $q - Qualifying information (R) |