Information sources on the petrochemical industry
| Awdur Corfforaethol: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
New York
United Nations
1978.
|
| Cyfres: | UNIDO guides to information sources
no.29 |
| Pynciau: |