| Verfasser | Häufigkeit |
|---|---|
| Burckhard, Suzette R. | 2 |
| Hodson, Mike | 2 |
| Kasmire, Julia | 2 |
| Lyon, John G. | 2 |
| McMeekin, Andrew | 2 |
| Stehlin, John G. | 2 |
| Trimble, Stanley Wayne | 2 |
| Ward, Andrew David | 2 |
| Ward, Kevin 1969- | 2 |
| Dennis, Will | 1 |
| Tveitereid, Knut | 1 |
| Ward, Andrew | 1 |
| Ward, Peter | 1 |
| Williams, John 1954- | 1 |