| Verfasser | Häufigkeit |
|---|---|
| Pilkey, Walter D. | 6 |
| Pilkey, Deborah F. | 4 |
| Bi, Zhuming | 3 |
| Pilkey, Deborah F. 1971- | 3 |
| Peterson, Rudolph Earl 1901- | 2 |
| Peterson, Rudolph E. | 1 |
| Pilkey, Walter D. 1936-2007 | 1 |
| Verfasser | Häufigkeit |
|---|---|
| Pilkey, Walter D. | 6 |
| Pilkey, Deborah F. | 4 |
| Bi, Zhuming | 3 |
| Pilkey, Deborah F. 1971- | 3 |
| Peterson, Rudolph Earl 1901- | 2 |
| Peterson, Rudolph E. | 1 |
| Pilkey, Walter D. 1936-2007 | 1 |