Input Standards | |||
| Optional/Optional | |||
| 1st Indicator Undefined | |||
| Undefined | |||
| 2nd Indicator Undefined | |||
| Undefined | |||
| Subfields (R=Repeatable NR=Nonrepeatable) | Input Standards | ||
| ‡a | Category of material (007/00) (NR) | Mandatory/Mandatory | |
| ‡b | Specific material designation (007/01) (NR) | Mandatory/Mandatory | |