Publishing for schools textbooks and the less developed countries.
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | Washington
          World Bank
    
        c1980. | 
| Cyfres: | World Bank staff working paper
              398 | 
| Pynciau: |