| Verfasser | Häufigkeit |
|---|---|
| Boyce, Ronald R. | 26 |
| Ullman, Edward Louis | 26 |
| Volk, Donald J. | 26 |
| Boyce, David E. 1938- | 3 |
| Day, Norman D. | 3 |
| McDonald, Chris 1943- | 3 |
| Boyce, D. E. | 1 |
| Day, N. D. | 1 |
| MacDonald, C. | 1 |
| Verfasser | Häufigkeit |
|---|---|
| Boyce, Ronald R. | 26 |
| Ullman, Edward Louis | 26 |
| Volk, Donald J. | 26 |
| Boyce, David E. 1938- | 3 |
| Day, Norman D. | 3 |
| McDonald, Chris 1943- | 3 |
| Boyce, D. E. | 1 |
| Day, N. D. | 1 |
| MacDonald, C. | 1 |