Practical benefits on space exploration a digest of papers presented at the United Nations Conference on the Exploration and Peaceful Uses of Outer Space, Vienna, 1968.
| Egile korporatiboa: | , | 
|---|---|
| Formatua: | Liburua | 
| Hizkuntza: | English | 
| Argitaratua: | New York
          United Nations
    
        1969. | 
| Gaiak: |