| Verfasser | Häufigkeit |
| Clack, Jerry |
17 |
| Clack, Timothy |
13 |
| Clack, Brian R. |
7 |
| Clack, Gordon D. |
6 |
| Clack, Jerry 1926- |
6 |
| Clack, Beverley |
4 |
| Clack, Beverley 1964- |
4 |
| Clack, Jennifer A. 1947-2020 |
4 |
| Brittain, Marcus |
3 |
| Clack, Amanda |
3 |
| Johnson, Rob 1967- |
3 |
| Clack, Chris |
2 |
| Clack, Doris H. |
2 |
| Clack, Doris Hargrett |
2 |
| Clack, Garfield |
2 |
| Clack, George |
2 |
| Clack, Jennifer A. |
2 |
| Clack, Neville A. N. |
2 |
| Clack, Robert J. |
2 |
| Clack, Robert Wood |
2 |