| Verfasser | Häufigkeit |
| Anderson, Kenneth E. 1945- |
4 |
| Richardson, Rupert Norval 1891-1988 |
4 |
| Rupert, Timothy J. |
4 |
| Anderson, Adrian N. |
3 |
| Pope, Thomas R. |
3 |
| Wallace, Ernest |
3 |
| Anderson, Rupert |
2 |
| Anderson, Adrian |
1 |
| Bandy, D. Dale |
1 |
| Boswell, Angela 1965- |
1 |
| Wallace, Ernest 1906-1985 |
1 |
| Wintz, Cary D. 1943- |
1 |