Vuurproef
| Publisher | Zwarte Beertjes |
| Cover Art by | Dick Bruna |
| Translated by | J. F. kliphuis |
| Format | Paperback |
| Language | Dutch |
| Location | Netherlands |
| Cover Date | 1960 |
| Pages / Font | 188 pages |
| Catalog Number | Zwarte Beertjes 312 |
Added by iljin1
| Publisher | Zwarte Beertjes |
| Cover Art by | Dick Bruna |
| Translated by | J. F. kliphuis |
| Format | Paperback |
| Language | Dutch |
| Location | Netherlands |
| Cover Date | 1960 |
| Pages / Font | 188 pages |
| Catalog Number | Zwarte Beertjes 312 |