| Verfasser | Häufigkeit |
|---|---|
| Phaff, Herman J. | 5 |
| Miller, Martin W. | 4 |
| Mrak, E. M. 1901-1987 | 4 |
| Jongens, P. | 1 |
| Phaff, H. E. | 1 |
| Phaff, Herman Jan | 1 |
| Royaards, C. W. | 1 |
| Verfasser | Häufigkeit |
|---|---|
| Phaff, Herman J. | 5 |
| Miller, Martin W. | 4 |
| Mrak, E. M. 1901-1987 | 4 |
| Jongens, P. | 1 |
| Phaff, H. E. | 1 |
| Phaff, Herman Jan | 1 |
| Royaards, C. W. | 1 |