007 - Unspecified (R)
MARC 21 Bibliographic - Concise
Physical form of the described item is not identified by any other 007
category-of-material code. This category is also used for an item having multiple
physical forms that are not identified in separate 007 fields.
00 - Category of material
z - Unspecified
01 - Specific material designation
Special class of material to which the item belongs.
m - Multiple physical forms
u - Unspecified
z - Other
| - No attempt to code