| Verfasser | Häufigkeit |
|---|---|
| Lipsett, Roger | 11 |
| Schaefer, Carl F. | 11 |
| Ussery, Cary | 11 |
| Blench, Roger 1953- | 1 |
| Brown, Roger H. | 1 |
| Schaefer, Roger | 1 |
| Schaefer, Roger C. | 1 |
| Schaefer, Ronald P. 1949- | 1 |
| Schaefer, Stephen M. | 1 |
| Weschenfelder, Petra 1978- | 1 |
| Ziegelmeyer, Georg 19XX- | 1 |