Limited guidelines on the location of bar code symbols.
| Fformat: | Llyfr |
|---|---|
| Iaith: | English |
| Cyhoeddwyd: |
United Kingdom
[s.n.]
c1980.
|
| Pynciau: |
| Fformat: | Llyfr |
|---|---|
| Iaith: | English |
| Cyhoeddwyd: |
United Kingdom
[s.n.]
c1980.
|
| Pynciau: |