Henry Barnard's American journal of education
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr | 
| Iaith: | English | 
| Cyhoeddwyd: | Baltimore
          The Johns Hopkins press
    
        1945. | 
| Cyfres: | Half-title:  The Johns Hopkins university studies in historical and political science... | 
| Pynciau: |